This explains the most common computerterms which you can encounter. This list was compiled from several sources. It does not explain HTML commands in detail because for this purpose another encyclopedia is available.The most recent update of this document can be found at: http://www.uithuizen.net/encyclopedia/terms.php
machine readable In a form that a computer can accept. Machine-readable data includes files stored on disk or tape, or data that comes from a device connected to a computer. Even typewritten pages can be considered machine-readable if you have an optical character recognition (OCR) system.
macro a series of memory resident actions or commands that can be recognized as a group and that can be executed together usually this is achieved by linking it to a hotkey This makes macros a target for virues spreading via E-mail: because when you open the email and unknowingly hit the hotkey, your computer gets infected by the virus.
Macro virus Code written to take advantage of hotkey programming in email clients to let the virus deliver its payload or to perform replication.
mail bombing The act of flooding a person´s e-mail mail box with huge, lengthy files that have nothing to do with each other. It is a form of electronic harassment and against netiquette.
maillist/mailing List A (usually automated) system that allows people to send e-mail to one address, where their message is copied and sent to all of the other subscribers to the maillist. In this way, people who have many different kinds of e-mail access can participate in discussions together.
mailreader A program for handling E-mail, which is used with a POP- or IMAP server.
MAN Metropolitan Area Network. The MAN, an evolutionary step beyond the LAN, promises high-speed communications at distances greater than any LAN can handle.
MBM Acronym of Magnetic Bubble Memory. A memory technology in which the bits are stored in a film of magnetic material as magnetic bubbles.
MBR Memory Buffer Register. A programmer-invisible buffer in which the computer holds data for a store operation and into which it receives data during a load operation; not part of the register set. A popular target for viruses.
MBS Megabytes Per Second. A standard unit for reporting transfer rates.
MCA Micro Channel Architecture. IBM´s expanded-local-bus architecture introduced in its PS/2 family of personal computers.
MCB Memory Control Block. The data structure containing the length and owner (among other things) of a portion of the memory managed by DOS.
MCI Media Control Interface; a specification for the control of multimedia devices (ie MIDI-devices) and -files (ie .WAVfiles).
MDA Monochrome Display Adapter. The standard video display for the first IBM PC model, with one foreground color and one background color (e.g. green on black).
MDI Multiple Document Interface; a series of specifications defining how an application should handle multiple subframes within the visual working range of an application.
meta image format A non raster image format that can contain vector-as well as bitmap as text information.
metafile A metafile is a collection of GDI commands that creates desired text and/or images. A metafile picture usually contains vector picture information. A metafile picture can contain any kind of picture data, such as a raster picture.
MFLOPS Megaflops. A measurement of the speed of the computer, usually applied to scientific computers rather than general- purpose computers, that focuses on floating-point operations, rather than instruction executions.
MFM Modified Frequency Modulation. A method of encoding data as a series of magnetic flux reversals on disk or tape, commonly known as double-density recording. In contrast to FM, modified frequency modulation omits all clock pulses except those between pairs of zero bits. See also FM, RLL.
MHS Message Handling System. MHS refers to the Action Technologies and Novell implementation of a store-and-forward electronic mail system. Within the LAN industry, MHS has become a de facto standard for linking applications with internetwork transport systems. Also known as X.400.
MIDI Musical Instruments Digital Interface; a standard communications protocol for exchanging information between computers and musical synthesizers. It allows interaction between computers and music instruments.
MIME Multipurpose Internet Mail Extensions. The standard for attaching non-text files to standard Internet mail messages. Non-text files include graphics, spreadsheets, formatted word-processor documents, sound files, etc. The MIME standard is used by E-mail software and Web clients.
minicomputer A mid-scale computer, with processing power between that of a mainframe and a PC. Also midframe or midrange.
mips 1) Acronym of millions of instructions per second; a measure to compare speed of processors. 2) According to some people it means Meaningless Instructions Per Second. After you install certain operating systems like windows you can see that this is what your processor is doing most of the time.
mirror An exact duplicate of another object. For example, a popular web site may mirror its complete site or a popular file to multiple locations, allowing the site or file to be accessed faster in different parts of the world or help relieve stress on a server or making a copy of the FAT of a hard disk to be able to restore accidently deleted files or a formatted disk.
MIT Massachusetts Institute of Technology. A well-known university and research laboratory in Boston (USA), specialised in artificial intelligence.
MMORPG Acronym of Massive Multiplayer Online Role-Playing Game. Examples are Everquest and World of Warcraft. Fantasy games wherein thousands of people can play against each other simultaneously.
MMS Acronym of Multimedia Messaging a more advanced form of SMS, capable of using graphic and/or sound content.
MPC Multimedia Personal Computer; a computer system with necessary hardware (ie. cd-rom, MIDI-player or scanner) and software (drivers) for multimedia applications.
MPR A standard set by the Swedish government that sets the amount of electromagnetic fields that computerscreens are allowed to produce.
MR Mask Register. A register whose bits mask an operation (e.g. in an associative store the bits mask the fields that will not participate in a match; in an interrupt controller the bits mask interrupts and in a DMA controller the bits mask incoming requests for services).
MTBF Mean Time Between Failure. A measure for the reliability of a critical device like a harddisk.
MTU The Maximum Transmission Unit (MTU) of a network is the greatest amount of data that can be transferred in one physical frame on that network. Fragmentation will occur if a packet is sent across a network that has an MTU smaller than the packet´s frame length. This will lead to lower performance as fragments need to be reassembled. For Ethernet, 1500 is the maximum, and is recommended. The unofficial MTU for SLIPservers is 1006.
MUD Multi-User Dungeon or Dimension. A (usually text-based) multi-user simulation environment. Some are purely for fun and flirting, others are used for serious software development, or education purposes and all that lies in between. A significant feature of most MUDs is that users can create things that stay after they leave and which other users can interact with in their absence, thus allowing a world to be built gradually and collectively.
Multi-mode fiber A type of fiber optic cable that transmits its signal over multiple light pulses at different angles. Because the signal dissipates over long distances, multi-mode fiber cables are used only in short distances. When a longer fiber optic cabling is needed, single-mode fiber is used.
multimedia application An application that combines sounds, graphics or video together with text.
MZ The letters M and Z appear in numerous places in DOS (memory control blocks, .EXEheader, etc.); the conventional explanation is that these are the initials of Mark Zbikowski, one of the principal architects of MSDOS 2.0.
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