Glossary - U

unnamed pipe -

A circular buffer, created in memory, used by related processes to communicate with one another. Contrast with named pipe.
unordered list -
In Information Presentation Facility, a vertical arrangement of items in a list, with each item in the list preceded by a special character or bullet.
update region -
A system-provided area of dynamic storage containing one or more (not necessarily contiguous) rectangular areas of a window that are visually invalid or incorrect, and therefore are in need of repainting.
user interface -
Hardware, software, or both that allows a user to interact with and perform operations on a system, program, or device.
User Shell -
A component of OS/2 that uses a graphics-based, windowed interface to allow the user to manage applications and files installed and running under OS/2.
utility program -
(1) A computer program in general support of computer processes; for example, a diagnostic program, a trace program, a sort program. (T) (2) A program designed to perform an everyday task such as copying data from one storage device to another. (A)

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