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UltraPack: A file and folder compression format that offers better compression than standard or HiPack compression.
Undo: A feature in application software that allows the user to cancel the action of the previous instruction.
Upper Memory Block: noncontiguous section of allocatable memory located between the 640K and 1024K addresses.
VCACHE: A 32-bit, protected-mode cache driver, which replaces the 16-bit, real-mode SMART Drive disk cache software.
Virtual Control Program Interface: A simple API for protected-mode programs to allocate memory and switch into or out of protected mode.
Virtual memory: Memory that appears to an application to be larger and more uniform than it is.
Virus: A program which attaches itself to other programs for the purpose of duplicating itself. Viruses often (but not always) contain harmful code, which is triggered by some event, after a certain number of reproductions, or on a specific date.
Volatile Memory: Memory (such as electronic semiconductor memory) that loses its contents in the event of a power interruption.
WORM (Write Once, Read Many): A storage medium, which may be written exactly once, but may not be altered once data is stored.
Worm: A program, which duplicates itself, typically across networks. In contrast to a virus, a worm does not attach itself to other programs, but can reproduce itself independently.
Write-behind caching: Temporarily storing data in memory before it is written on disk for permanent storage.
Write-Through: One of two main types of caches, the write-through cache immediately writes any new information to the medium it is caching, so that the cache never contains information which is not already present on the cached device.
XBDA: see Extended BIOS Data Area.
XMS: see Extended Memory Specification.
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