Internet Golssary & Popular Internet Terms

Internet Glossary

The world of SEO and Internet Marketing has gained considerable popularity in the last few years, and has its own language and dictionary of terms. We have compiled a list of some of the most used words in Search Engine Optimization and other Internet related terms to help you.

Select a letter to see the terms starting with this letter.

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Glossary starting with 'M'

Clicking on the glossary term will take you to information about that term.
• m-commerce • Macro Virus • Macrocontent • MAE • Magellan • Mail Header • Mail Merge • Mail Reflector • Mailbomb • Mailbot • Mailbox • mailer-daemon • Mailing List • Mailing List Manager • mailto • Mainframe Computer • Major Geographic Domain • Majordomo • Malicious Mobile Code • Malware • man-in-the-middle attack • Managed Service Provider • Management Information System • Mandatory User Profile • Manual Link • MAPI • Markup Language • Marquee • Marquee Component • Master File • MathML • Mbone • MCP • MCSA • MCSD • MCSE • Media Stream • Melissa • Meltdown • Mesh Network • Message • Message Header • Message of the day • Message Queue • Message Queuing • Message Security Protocol • Messaging • Messaging Client • Meta-Content Format • Metatag • mget • MHTML • MIB • Microbrowser • Microcontent • Microsite • Microsoft .NET Messenger Service • Microsoft FrontPage • Microsoft Internet Explorer • Microsoft MSN Explorer • Microsoft MSN Messenger Service • Microsoft Network • Microsoft Office • Microsoft Outlook • Microsoft Project • Microsoft Reader • Microsoft Tech�Ed • Microsoft Visual Studio .NET • Microsoft Windows • Microsoft Windows Messenger • Microsoft Windows NT • Microsoft XML • Middleware • Military Network • MILNET • MIME • Minicomputer • Minisite • Mirror Site • Mirroring • Misc. Newsgroups • MMDS • Mobile Computing • Mobile Explorer • Mobile Information Server • Mobile IP • modec • Modem • Modem Bank • Modem Eliminator • Moderated • Moderator • Modulation • MOM • MOO • MooV • Morphing • Mosaic • Motion JPEG • Mousetrapping • Mozilla • mozilla.org • MP3 • MPEG • MPEG-1 • MPEG-2 • MPEG-3 • MPEG-4 • MPI • mput • MR • MSDN • MSN • MSN Explorer • MSN Messenger Service • MSXML • MTA • MTTR • MTU • MUD • Multimode Phone • Multipartite Virus • Multiple Recipients • Multiplexer • Multipoint Configuration • Multipurpose Internet Mail Extensions • Multipurpose Internet Mail Extensions HTML • Multisystem Network • Multiuser System • MUSE • my two cents • MYOB

#	Term and Description
1.	m-commerce Mobile Commerce. M commerce involves the use of personal digital assistants (PDAs), digital phones, and other wireless handheld devices equipped with microbrowsers for the online buying and selling of goods. M-commerce is distinguished from other electronic commerce by the level of portability. Wireless Application Protocol (WAP) standards form the foundation of m-commerce technology, which takes advantage of smart phone capabilities with e-mail, fax, Internet, and phone in one mobile unit.
2.	Macro Virus A virus that is written in a macro language associated with an application. The macro virus is carried by a document file used with that application and executes when the document is opened.
3.	Macrocontent The primary text or other content of a Web page.
4.	MAE Metropolitan Area Exchange.
5.	Magellan A Web directory. Named for the Portuguese explorer, Magellan reviews and rates all Web sites it lists. Published by the McKinley Group, Magellan is now owned by Excite, Inc.
6.	Mail Header A block of text at the top of an e-mail message containing such information as the addresses of the sender and recipients, the date and time sent, the address to which a reply is to be sent, and the subject. The mail header is used by an e-mail client or program.
7.	Mail Merge A mass-mail facility that takes names, addresses, and sometimes pertinent facts about recipients and merges the information into a form letter or another such basic document.
8.	Mail Reflector A newsgroup that consists simply of the messages posted to a mailing list translated into newsgroup format.
9.	Mailbomb 1. An excessively large amount of e-mail data (a very large number of messages or one very large message) sent to a user's e-mail address in an attempt to make the user's mailer program crash or to prevent the user from receiving further legitimate messages. 2. To send a mailbomb to a user. One person might mailbomb a user with a single enormous message; a large number of users might mailbomb an unpopular person by simultaneously sending messages of normal size.
10.	Mailbot A program that automatically responds to e-mail messages or performs actions based on commands within the messages. A mailing list manager is one example.
11.	Mailbox A disk storage area assigned to a network user for receipt of e-mail messages.
12.	mailer-daemon A program used to transport e-mail between hosts on a network.
13.	Mailing List A list of names and e-mail addresses that are grouped under a single name. When a user places the name of the mailing list in a mail client's To: field, the client sends the message to the machine where the mailing list resides, and that machine automatically sends the message to all the addresses on the list (possibly allowing a moderator to edit it first).
14.	Mailing List Manager Software that maintains an Internet or intranet mailing list. The mailing list manager accepts messages posted by subscribers; sends copies of the messages (which may be edited by a moderator) to all the subscribers; and accepts and processes user requests, such as to subscribe or to unsubscribe to the mailing list. The most commonly used mailing list managers are LISTSERV and Majordomo.
15.	mailto A protocol designator used in the HREF of a hyperlink that enables a user to send e-mail to someone.
16.	Mainframe Computer A high-level, typically large and expensive computer designed to handle intensive computational tasks. Mainframe computers are characterized by their ability to simultaneously support many users connected to the computer by terminals. The name is derived from "main frame", the cabinet originally used to house the processing unit of such computers.
17.	Major Geographic Domain A two-character sequence in an Internet domain name address that indicates the country/region in which a host is located. The major geographic domain is the last part of the domain name address, following the subdomain and domain codes; for example, uiuc.edu.us indicates a host at the University of Illinois in the United States, whereas cam.ac.uk indicates a host at the University of Cambridge in the United Kingdom. The code .us, which indicates a domain in the United States, is usually omitted.
18.	Majordomo The name of a popular software program that manages and supports Internet mailing lists.
19.	Malicious Mobile Code A virus or other destructive program that takes advantage of security weaknesses in wireless transmission systems. Malicious mobile code may affect computers, PDAs, Internet-capable digital phones, and other wireless networking devices.
20.	Malware Software created and distributed for malicious purposes, such as invading computer systems in the form of viruses, worms, or innocent-seeming plugins and extensions that mask other destructive capabilities.
21.	man-in-the-middle attack A form of attack in which the intruder intercepts messages between parties in a public key exchange. Each party�s messages are diverted to the intruder, who may alter them before sending them on. The parties on each end of the exchange remain unaware that their messages are being intercepted and modified.
22.	Managed Service Provider A business that supplies remote access services to individuals and enterprises. Managed service providers offer remote connections, network management, user support, security, and applications hosting.
23.	Management Information System A computer-based system for processing and organizing information so as to provide various levels of management within an organization with accurate and timely information needed for supervising activities, tracking progress, making decisions, and isolating and solving problems.
24.	Mandatory User Profile A user profile that is not updated when the user logs off. It is downloaded to the user's desktop each time the user logs on, and it is created by an administrator and assigned to one or more users to create consistent or job specific user profiles.
25.	Manual Link A link that requires you to take action to update your data after the data in the source document changes.
26.	MAPI Messaging Application Programming Interface.
27.	Markup Language A set of codes in a text file that instructs a computer how to format the file on a printer or video display or how to index and link its contents. Examples of markup languages are Hypertext Markup Language (HTML) and Extensible Markup Language (XML), which are used in Web pages, and Standard Generalized Markup Language (SGML), which is used for typesetting and desktop publishing purposes and in electronic documents. Markup languages of this sort are designed to enable documents and other files to be platform-independent and highly portable between applications.
28.	Marquee A nonstandard HTML extension that causes scrolling text to appear as part of a Web page. Currently, marquees are viewable only with Internet Explorer.
29.	Marquee Component A region on a page that displays a horizontally scrolling text message.
30.	Master File In a set of database files, the file containing more or less permanent descriptive information about the principal subjects of the database, summary data, and one or more critical key fields. For example, customers� names, account numbers, addresses, and credit terms might be stored in a master file.
31.	MathML Mathematical Markup Language. An XML application for describing mathematical notation and capturing both its structure and content. The goal of MathML is to enable mathematics to be served, received, and processed on the Web, just as HTML has enabled this functionality for text.
32.	Mbone Multicast Backbone. A small set of Internet sites, each of which can transmit real-time audio and video simultaneously to all the others. MBONE sites are equipped with special software to send and receive packets at high speed using the IP one-to-many multicasting protocol. The MBONE has been used for video conferencing and even for a Rolling Stones concert in 1994.
33.	MCP Microsoft Certified Professional.
34.	MCSA Microsoft Certified Systems Administrator.
35.	MCSD Microsoft Certified Solution Developer.
36.	MCSE Microsoft Certified System Engineer.
37.	Media Stream A continuous sequence of audio or audio-and-video through a network.
38.	Melissa A macro virus that affects Word files in Microsoft Office 97 and Office 2000 and first appeared in the spring of 1999. Melissa is delivered as an attachment to an e-mail with the subject line "An Important Message From <user name>", a message beginning "Here is that document you asked for", or both. When the attachment is opened, the virus propagates (if Microsoft Outlook is installed) by sending itself to the first 50 e-mail addresses in the user's Outlook address book. On the infected machine, the virus also changes the registry, infects the Normal.dot Word template (which, in turn, infects new documents), and, in Office 2000, disables the Word macro virus warning. Although the Melissa virus does not destroy data, it can affect e-mail performance through the increased volume of messages. If an infected document is open at a time when the day of the month is the same as the minute value of the current time, the virus inserts the text "Twenty-two points, plus triple-word-score, plus fifty points for using all my letters. Game's over. I'm outta here" at the current location of the cursor. The virus was named after an acquaintance of the hacker who developed it.
39.	Meltdown 1. The complete collapse of a computer network caused by a higher level of traffic than the network can support. The term refers, by analogy, to the accidental melting down of a nuclear reactor core. 2. Colloquially, the breakdown of a person, usually in a job situation, caused by overwork, stress, or failure.
40.	Mesh Network A communications network having two or more paths to any node.
41.	Message 1. In communications, a unit of information transmitted electronically from one device to another. A message can contain one or more blocks of text as well as beginning and ending characters, control characters, a software generated header (destination address, type of message, and other such information), and error-checking or synchronizing information. A message can be routed directly from sender to receiver through a physical link, or it can be passed, either whole or in parts, through a switching system that routes it from one intermediate station to another. See also frame (definition 1), frame (definition 2), header, message switching, network, packet (definition 1), packet switching, synchronous transmission. 2. In software, a piece of information passed from the application or operating system to the user to suggest an action, indicate a condition, or inform that an event has occurred. 3. In message-based operating environments, such as Windows, a unit of information passed among running programs, certain devices in the system, and the operating environment itself.
42.	Message Header A sequence of bits or bytes at the beginning of a message that usually provides a timing sequence and specifies such aspects of the message structure as its length, data format, and block identification number.
43.	Message of the day A daily bulletin for users of a network, multiuser computer, or other shared system. In most cases, users are shown the message of the day when they log into the system.
44.	Message Queue An ordered list of messages awaiting transmission, from which they are taken up on a first in, first out (FIFO) basis.
45.	Message Queuing A message queuing and routing system for Microsoft Windows that enables distributed applications running at different times to communicate across heterogeneous networks and with computers that may be off line. Message Queuing provides guaranteed message delivery, efficient routing, security, and priority-based messaging. Message Queuing was formerly known as MSMQ.
46.	Message Security Protocol A protocol for Internet messages that is based on the use of encryption and verification to ensure security. It also allows for permissions at the server level for delivery or rejection of e-mail.
47.	Messaging The use of computers and data communication equipment to convey messages from one person to another, as by e-mail, voice mail, or fax.
48.	Messaging Client An application program that enables its user to send or receive messages (such as e-mail or fax) to and from other users with the help of a remote server.
49.	Meta-Content Format An open format for describing information about content of a structured body of data such as a Web page, a set of files on a Windows desktop, or a relational database. Meta-Content Format might be used for indexes, data dictionaries, or price lists.
50.	Metatag A tag in an HTML or XML document that allows a Web-page creator to include such information as the author's name, keywords identifying content, and descriptive details (for example, non-text objects on the page). The information that is marked with metatags does not appear on the Web page when a user views it in a browser, but it can be viewed in the HTML or XML source. Metatags are included in the head of a document and are often used to assist search engines in indexing the page.
51.	mget Multiple Get. A command in most FTP clients with which a user can request the transfer of several files at once.
52.	MHTML Multipurpose Internet Mail Extension Hypertext Markup Language, or MIME HTML. A standard method for sending an HTML document encapsulated with inline graphics, applets, linked documents, and other items referred to in the HTML document.
53.	MIB Management Information Base.
54.	Microbrowser An application for mobile phones that allows users to access the Internet to send and receive e-mail and browse the Web. Microbrowsers don't have the full functionality of a Web browser on a PC. For instance, microbrowsers are capable of loading only stripped-down text versions of Web pages. Most microbrowser products are built to utilize the Wireless Application Protocol (WAP) standard.
55.	Microcontent Short pieces of text on a Web page that help provide an overview of the page's contents. Microcontent introduces, summarizes, or enhances the macrocontent of a Web page, and includes headings, page titles, ALT text, links, and subheads.
56.	Microsite 1. A small Web site targeted to a single message or topic and nested within a larger site. Microsites geared to promotional and sales of specific products and services may be integrated into popular Web sites by advertisers. 2. A small Web site with a single focus.
57.	Microsoft .NET Messenger Service See .NET Messenger Service.
58.	Microsoft FrontPage A program you can use to create and manage Internet and intranet sites without programming; FrontPage is available as part of one of the Microsoft Office suites or as a stand-alone product.
59.	Microsoft Internet Explorer See "Internet Explorer".
60.	Microsoft MSN Explorer See "MSN Explorer".
61.	Microsoft MSN Messenger Service See .NET Messenger Service.
62.	Microsoft Network See MSN.
63.	Microsoft Office See "Office".
64.	Microsoft Outlook See "Outlook".
65.	Microsoft Project A software application developed by Microsoft Corporation to simplify the planning and management of projects. Microsoft Project includes features that help you build and manage projects, set schedules and milestones, and communicate and share ideas with team members.
66.	Microsoft Reader A software application developed by Microsoft for downloading electronic books and other publications onto any personal computer, laptop computer, or Pocket PC handheld device. Additional features allow users to bookmark pages, highlight text, write notes, and look up definitions.
67.	Microsoft Tech�Ed An annual training conference held by Microsoft Corporation to educate engineers and businesses using Microsoft technology. The conference provides attendees with access to information, experts, and training labs on Microsoft's latest technologies.
68.	Microsoft Visual Studio .NET A complete development environment for building on the Microsoft .NET technology. Using Visual Studio .NET, developers can create secure, scalable applications and Web services quickly in the language of their choice, leveraging existing systems and skills.
69.	Microsoft Windows See "Windows".
70.	Microsoft Windows Messenger See .NET Messenger Service.
71.	Microsoft Windows NT See "Windows NT".
72.	Microsoft XML See "MSXML".
73.	Middleware Software that sits between two or more types of software and translates information between them. Middleware can cover a broad spectrum of software and generally sits between an application and an operating system, a network operating system, or a database management system. Examples of middleware include Common Object Request Broker Architecture (CORBA) and other object broker programs and network control programs.
74.	Military Network See "MILNET".
75.	MILNET Military Network. A wide area network that represents the military side of the original ARPANET. MILNET carries nonclassified U.S. military traffic.
76.	MIME Multipurpose Internet Mail Extensions. A protocol widely used on the Internet that extends the SMTP (Simple Mail Transfer Protocol) to permit data, such as video, sound, and binary files, to be transmitted by Internet e-mail without having to be translated into ASCII format first.
77.	Minicomputer A mid-level computer built to perform complex computations while dealing efficiently with a high level of input and output from users connected via terminals. Minicomputers also frequently connect to other minicomputers on a network and distribute processing among all the attached machines. Minicomputers are used heavily in transaction-processing applications and as interfaces between mainframe computer systems and wide area networks.
78.	Minisite See "Microsite".
79.	Mirror Site A file server that contains a duplicate set of files to the set on a popular server. Mirror sites exist to spread the distribution burden over more than one server or to eliminate the need to use high-demand international circuits.
80.	Mirroring 1. In a network, a means of protecting data on a network by duplicating it, in its entirety, on a second disk. Mirroring is one strategy implemented in RAID security. 2. On the Internet, replicating a Web site or an FTP site on another server. A site is often mirrored if it is frequently visited by multiple users. This eases the network traffic to the site, making it easier for users to gain access to the information or files on it. A site may also be mirrored in different geographic locations to facilitate downloading by users in various areas.
81.	Misc. Newsgroups Usenet newsgroups that are part of the misc. hierarchy and have the prefix misc. These newsgroups cover topics that do not fit into the other standard Usenet hierarchies (comp., news., rec., sci., soc., talk.).
82.	MMDS Multichannel Multipoint Distribution Service.
83.	Mobile Computing The process of using a computer while traveling. Mobile computing usually requires a portable computer that is battery powered, rather than a desktop system.
84.	Mobile Explorer A modular wireless applications and services platform designed by Microsoft to power Web-enabled wireless telephones. When connected to a wireless network, Mobile Explorer provides secure mobile access to corporate or personal e mail, corporate networks, and the Internet. It includes a multimode microbrowser, which can display Web content coded in a variety of markup languages used for small, handheld devices, including cHTML, HTML, WAP 1.1, and WML.
85.	Mobile Information Server A software application developed by Microsoft to allow telecommunications carriers, enterprise customers, and business partners to securely extend Microsoft Exchange Server information, corporate intranet applications, and services to users of wireless handheld computing devices. Microsoft Information Server provides mobile users with access to personal services and data stored on the intranet, such as e-mail, document files, appointment calendars, and contacts.
86.	Mobile IP Mobile Internet Protocol. An Internet protocol designed to support host mobility. Mobile IP enables a host to remain connected to the Internet with the same IP address (called the home address) while moving to different locations. Mobile IP tracks a moving host by registering the presence of the host with a foreign agent; the home agent then forwards packets to the remote network.
87.	modec In telecommunications, a device that generates analog modem signals digitally. The term modec is a combination of the terms modem and codec (coder/ decoder�or hardware that can convert audio or video signals between analog and digital forms).
88.	Modem 1. Short for modulator/demodulator. A communications device that converts between digital data from a computer or terminal and analog audio signals that can pass through a standard telephone line. Because the telephone system was designed to handle voice and other audio signals and a computer processes signals as discrete units of digital information, a modem is necessary at both ends of the telephone line to exchange data between computers. At the transmit end, the modem converts from digital to analog audio; at the receiving end, a second modem converts the analog audio back to its original digital form. In order to move a high volume of data, high-speed modems rely on sophisticated methods for "loading" information onto the audio carrier�for example, they may combine frequency shift keying, phase modulation, and amplitude modulation to enable a single change in the carrier's state to represent multiple bits of data. In addition to the basic modulation and demodulation functions, most modems also include firmware that allows them to originate and answer telephone calls. International standards for modems are specified by the International Telecommunications Union, or ITU. Despite their capabilities, modems do require communications software in order to function. Compare digital modem. 2. Any communications device that acts as an interface between a computer or terminal and a communications channel. Although such a device may not actually modulate or demodulate analog signals, it may be described as a modem because a modem is perceived by many users to be a black box that connects a computer to a communications line (such as a high-speed network or a cable TV system).
89.	Modem Bank A collection of modems connected to a server maintained by an ISP or the operator of a BBS or remote-access LAN. Most modem banks are configured to allow a remote user to dial a single phone number that routes calls to an available phone number on the bank.
90.	Modem Eliminator A device that enables two computers to communicate without modems.
91.	Moderated Subjected to review by a moderator, who may remove irrelevant or inflammatory articles or messages before redistributing them through a newsgroup, mailing list, or other messaging system.
92.	Moderator In some Internet newsgroups and mailing lists, a person through whom all messages are filtered before they are distributed to the members of the newsgroup or list. The moderator discards or edits any messages that are not considered appropriate.
93.	Modulation 1. The process of changing or regulating the characteristics of a carrier wave vibrating at a certain amplitude (height) and frequency (timing) so that the variations represent meaningful information. 2. In computer communications, the means by which a modem converts digital information sent by a computer to the audio form that it sends over a telephone line.
94.	MOM Messaging-oriented Middleware. A class of programs that translates data and messages between applications that use one format and communications services (such as NetBIOS and TCP/IP) that expect a different format.
95.	MOO MUD, object-oriented. A type of virtual environment on the Internet, similar to a game-oriented MUD but based on an object-oriented language and generally focused more on programming than on games.
96.	MooV The file format for QuickTime movies that stores synchronized tracks for control, video, audio, and text.
97.	Morphing Short for metamorphosing. A process by which one image is gradually transformed into another, creating the illusion of a metamorphosis occurring in a short time. A common motion picture special-effects technique, morphing is available in many advanced computer animation packages.
98.	Mosaic The first popular graphical World Wide Web browser.
99.	Motion JPEG A standard for storing motion video, proposed by the Joint Photographic Experts Group (JPEG), that uses JPEG image compression for each frame.
100.	Mousetrapping A practice employed by some Web sites in which the back and exit buttons of a visitor's Web browser are disabled and attempts to leave the site are redirected to other pages on the site or to other sites against the visitor's will. Mousetrapping is most often associated with adult-oriented Web sites.
101.	Mozilla A nickname for the Netscape Navigator (later, Netscape Communicator) Web browser, coined by the Netscape Corporation.
102.	mozilla.org The name of the group charged by the Netscape Corporation to act as a clearing house for Mozilla-related matters, such as questions, changes to code, bug reporting, forums, and so on.
103.	MP3 MPEG Audio Layer-3. A digital audio coding scheme used in distributing recorded music over the Internet. MP3 shrinks the size of an audio file by a factor of 10 to 12 without seriously degrading the quality (CDrecording level) of the sound. MP3 files are given the file extension .mp3. Although MP3 is part of the MPEG family, it is audio-only and is not the same as the now-defunct MPEG-3 standard.
104.	MPEG 1. Acronym for Moving Picture Experts Group. A set of standards for audio and video compression established by the Joint ISO/IEC Technical Committee on Information Technology. The MPEG standard has different types that have been designed to work in different situations. Compare Motion JPEG. 2. A video/audio file in the MPEG format. Such files generally have the extension .mpg.
105.	MPEG-1 The original MPEG standard for storing and retrieving video and audio information, designed for CD-ROM technology. MPEG-1 defines a medium bandwidth of up to 1.5 Mbps, two audio channels, and noninterlaced video.
106.	MPEG-2 An extension of the MPEG-1 standard designed for broadcast television, including HDTV. MPEG-2 defines a higher bandwidth of up to 40 Mbps, five audio channels, a wider range of frame sizes, and interlaced video.
107.	MPEG-3 Initially an MPEG standard designed for HDTV (high-definition television), but it was found that MPEG-2 could be used instead. Therefore, this standard no longer exists.
108.	MPEG-4 A standard currently under development designed for videophones and multimedia applications. MPEG-4 provides a lower bandwidth of up to 64 Kbps.
109.	MPI Message Passing Interface. A specification for message passing on workstation clusters and massively parallel processing (MPP) architectures. MPI was designed as a proposed standard by the MPI Forum, a committee of vendors and users.
110.	mput In many FTP clients, the command that instructs the local client to transmit multiple files to the remote server.
111.	MR Modem Ready. A light on the front panel of a modem indicating that the modem is ready.
112.	MSDN Microsoft Developer Network. An online, print, and CDDVD resource for developers that features content and programs focused on development trends and Microsoft technologies. Some features of MSDN include technical articles and reference material; information on upcoming conferences and events; developer support through peer-to-peer interaction, information sharing, and direct interaction with Microsoft; and software subscription programs.
113.	MSN Microsoft Network. An online service and Internet portal, launched with the introduction of Windows 95 in August 1995.
114.	MSN Explorer Microsoft software that integrates the functionality of Internet Explorer, Windows Media Player, Hotmail, MSN Messenger, MSN Communities, Music Central, and other MSN content and services.
115.	MSN Messenger Service See .NET Messenger Service.
116.	MSXML Microsoft XML. A Java-based XML parser from Microsoft that provides support for World Wide Web Consortium (W3C) standards for XML documents and applications.
117.	MTA Message Transfer Agent. An application process, as described in the X.400 message-handling system, responsible for delivering e-mail messages. After receiving a message, an MTA stores it temporarily and either delivers it or forwards it to another MTA. During this process, the MTA can change the message headers.
118.	MTTR Mean Time To Repair. The average time interval, usually expressed in hours, that it takes to repair a failed component.
119.	MTU Maximum Transmission Unit.
120.	MUD Multiuser Dungeon. A virtual environment on the Internet in which multiple users simultaneously participate in a role-playing game generally a medieval fantasy, hence the "dungeon" and interact with each other in real time.
121.	Multimode Phone Wireless phone that operates on both analog and digital networks. A multimode phone may be dual-mode (analog and one digital network) or trimode (analog and two digital networks).
122.	Multipartite Virus A type of virus that combines characteristics and techniques of both boot sector and file viruses. Multipartite viruses first infect either system sectors or files and then spread quickly to infect the entire system. Because of their multiple capabilities, multipartite viruses are difficult to remove from an infected system.
123.	Multiple Recipients 1. The capability of sending e-mail to more than one user at a time by listing more than one e-mail address on a line. Delimiters such as commas or semicolons are used to separate the e-mail addresses. See also e-mail1 (definition 1), mailing list. 2. The subscribers on a mailing list. A message sent to the list is addressed to the "multiple recipients of" the list.
124.	Multiplexer A device for funneling several different streams of data over a common communications line. Multiplexers are used either to attach many communications lines to a smaller number of communications ports or to attach a large number of communications ports to a smaller number of communications lines.
125.	Multipoint Configuration A communications link in which multiple stations are connected sequentially to the same communications line. Typically, the communications line is controlled by a primary station, such as a computer, and the stations attached to the line are secondary.
126.	Multipurpose Internet Mail Extensions See "MIME".
127.	Multipurpose Internet Mail Extensions HTML See "MHTML".
128.	Multisystem Network A communications network in which two or more host computers can be accessed by network users.
129.	Multiuser System Any computer system that can be used by more than one person. Although a microcomputer shared by several people can be considered a multiuser system, the term is generally reserved for machines that can be accessed simultaneously by several people through communications facilities or via network terminals.
130.	MUSE Multiuser Simulation Environment.
131.	my two cents An expression used informally in newsgroup articles and, less frequently, e-mail messages or mailing lists, to indicate that the message is the writer's contribution to an ongoing discussion.
132.	MYOB Mind your own business. An expression used in e-mail and newsgroups.

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