Radio buttons appear a lot in
Windows applications. They are used when you have to make a choice. For example you may be asked to select which of the following age groups are you in: Under 18; 19-30; 31-40; 41-50; over 50. Each option may have a circle by it & if you
click inside the circle it becomes selected ie goes from white to black. If you select a second option the first one becomes deselected - you can select only one from the list.
Redundant Array of Independent Disks
Random Access
Memory
Temporary storage area that the
processor uses to execute
Programs & hold
Data. Information is put into RAM & held there. Once the RAM becomes full information has to be removed to make space for the current task being performed. A PC with limited RAM will take a long time to perform the simplest task as the information in the RAM is constantly being replaced. RAM requires a constant electric supply to keep the information intact. Should you switch off the PC then you will lose the contents of RAM forever. Different areas of RAM include: Conventional
Memory; Expanded Memory; Extended Memory; High Memory Area; Upper Memory Area. Types of RAM include:
DRAM;
EDO RAM; SDRAM.
A 'rar' file is a type of segmented, compresed file
Remote Access Server
ROM chips cannot be written to. Therefore they contain information that never changes. All PC's have ROM chips. When the PC is switched on the Information in the ROM chip is used to test the
RAM. ROM does not require a constant electric supply to keep the information intact. Information in ROM is retained should you switch the PC off.
Software that allows
sound files to be transmitted from the
Internet back to the users PC in streams. What actually happens is that the file starts playing (ie you here the music) before all of the
data has been received - giving the effect of playing the sound instantaneously
Files are comprised of a number of records. Each record normally has a common set of characteristics. For example at a College a particular File may contain a record of all the students. Each record could contain Student ID, Date of Birth, Year enrolled etc.
A Back up is a duplicate
copy of some
data or a disk or some
software that is made by the user as a safeguard against the loss of the original information. Should this happen then the information can be recovered by restoring or copying the information back from the
backup.
A program routine that calls itself. Recursion occurs if a section of code contains an instruction to include another file that in itself contains instructions to include yet another file. This process must be controlled so that it does not occur indefinately.
Colorspace in which color
monitors display text and
images.
HTML documents typically indicate the amount of Red, Green and Blue used to make a certain color through the use of hexadecimal values (#ffffff).
By using particular HTML-code in a
Web page, one can redirect the visitor seamlessly to another Web page.
Form of protection against system failures. For example, if you want to be sure that you'll always have power supply, you can set up two power supplies so that one takes over if the other one fails.
A technology involving 2 or more
hard disks where the
data is distributed based on reliability & performance.
Place where
CPU stores numbers while performing calculations
A PC on a
network that has a number of
modems attached allowing the users to connect via telephone lines.
Same as
Remote Terminal. Any Computer or terminal that is not on the same physical
site as the computer to which it is attached. Access is normally via
Modem.
Same as Computer. Any Computer or terminal that is not on the same physical
site as the computer to which it is attached. Access is normally via
Modem.
The sharing of computer
files at multiple
locations whilst maintaining an up-to-date
copy of the shared file at all locations. A different copy of the file may be maintained at each location and replication ensures that all changes are reflected in all copies.
This relates to the quality of a viewed
image either on the PC Screen or printed output. For printed images the resolutions is measured in
dots per inch or
DPI. The higher the DPI the better the resolution.
A Back up is a duplicate
copy of some
data or a disk or some
software that is made by the user as a safeguard against the loss of the original information. Should this happen then the information can be recovered by restoring or copying the information back from the
backup.
Red-Green-Blue
A
file format - developed by Microsoft. Most word
processors can process Rich Text Format files - the format was developed to enable documents to be transferred between
application programs. Rich Text Format Files have the
file extension RTF.
Read Only
Memory
The highest point in the
Directory structure at which a user can access the
files. For a typical PC running this is C:.
The
path that
data travels along moving from its starting point in a
Network to its destination.
A communications device that
routes
data between
Networks.
Rich text
Format