General Packet Radio Service. A global system for mobile communications (GSM) channel aggregation system that increases per-channel speeds from 9,600 to 14,400 bits per second (bps), adding data compression. With GPRS, mobile data transmissions can be as fast as 115,000 bps using the existing GSM base station infrastructure. GPRS technology works well with services such as wireless Internet, wireless intranet, and multimedia. One of the main benefits of this technology is that users are, in effect, always connected, and yet are only charged for the amount of data actually transmitted.
On a Windows desktop, the recycle bin is like a trash basket where unneeded files can be thrown away. Dragging a file into the recycle bin removes it from its former place on the computer, and emptying the recyle bin deletes all the files in the bin.
NT (New Technology) File System. The file system used by Windows NT. It supports multiple file systems, has file recovery for hard disk crashes, uses the Unicode character set, and provides for file names up to 255 characters long.
Synchronous Data Link Control. A data transfer protocol used in IBM's SNA networks. SDLC conforms to ISOâ€™s High-level Data Link Control (HDLC) and ANSIâ€™s Advanced Data Communication Control Procedures (ADCCP).
Specialized computers that store and forward data packets between networks, first determining all possible paths to the destination address and then picking the best route based on traffic load and number of hops. A router can be a hardware device or a combination of hardware and software.
(Post Office Protocol, version 3 host). The central repository where electronic mail is stored before the recipient downloads it; analogous to a U.S. Mail post office box where mail is stored waiting to be picked up. In an email address, the POP3 host is the part to the right of the @ symbol.
|Microsoft Windows NT|
Microsoft Windows New Technology. A 32-bit operating system from Microsoft for high-end workstations, servers, and networks. It has built-in networking, pre-emptive multitasking, multi-threading, memory protection, and fault tolerance. It can be used on PCs and other types of computers, including DEC Alpha. Windows NT supports the Unicode character set, which allows more characters than standard ASCII. The minimum requirements for Windows NT are an 80386 processor, and at least 12 megabytes of RAM. Windows NT has become especially popular as a server because of its extra security features.
Codes in HTML that give instructions for formatting or other actions. World Wide Web documents are set up using HTML tags which serve various functions such as controlling the styling of text and placement of graphic elements and providing links to interactive programs and scripts. Examples of tags are . . .
baseline return, which creates a line break;
a pair of tags that horizontally center the enclosed text;
image source, used to insert a graphic image into an HTML document.
Graphical Device Interface, Graphics Device Interface, or Graphics Display Interface. The system by which graphics are displayed in Microsoft Windows. The application in use sends GDI the parameters for the image to be represented. GDI produces the image by sending commands to the monitor, printer, or other output device. Newer versions of Windows also have the DirectDraw interface, adding a faster mechanism for displaying games, full-motion video and 3-D objects. When the CPU is not busy, GDI updates the video display. When the CPU is busy, DirectDraw allows the application to communicate directly with the video adapter.
|DSL Access Multiplexer (DSLAM)|
Digital Subscriber Line Access Multiplexer (DSLAM). A mechanism used by the phone company to link customers' DSL connections to a single high-speed ATM line.
Virtual Local Area Network. A division of a local area network by software rather than by physical arrangement of cables. Division of the LAN into subgroups can simplify and speed up communications within a workgroup. Switching a user from one virtual LAN to another via software is also easier than rewiring the hardware.
- Virtual Memory. A way of using disk storage space to make the computer work as if it had more memory. When a file or program is too big for the computer to work with in its memory, part of the data is stored on disk. This virtual storage is divided into segments called pages; each page is correlated with a location in physical memory, or RAM. When an address is referenced, the page is swapped into memory; it is sent back to disk when other pages must be called. The program runs as if all the data is in memory. The computer uses a hardware device called a memory management unit (MMU) to manage virtual memory. 2. Virtual machine. A computer that does not exist as a physical device, but is simulated by another computer. 3. Virtual Machine. An IBM virtual data processing system, in which multiple operating systems and programs can be run by the computer at the same time. Each user appears to have an independent computer with its own input and output devices.
UNIX System Laboratories. The division of AT&T which was responsible for UNIX from 1990 until it was acquired by Novell in 1993.
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