HP TACL Programming Manual page 222

Glossary
Glossary–10
user process. A process whose primary purpose is to solve a user's problem. A user
process is not essential to the availability of a processor module and is created only
when the user explicitly creates it. Contrast with system process.
variable. A named quantity that can assume any of a given set of values.
variable level. A portion of a variable that can be individually addressed. New levels
can be added to the top of a variable stack, pushing down earlier levels, and can be
popped off the top of the stack. When the last level is popped, the variable ceases to
exist. For simplicity, variable levels are referred to as variables in many descriptions in
this manual.
variable line. A portion of a variable level that ends with a binary zero (an internal end-
of-line character). Lines can be removed from the beginning of a variable level with
the #EXTRACT and #EXTRACTV functions and can be added to the end of a variable
level with the #APPEND and #APPENDV function.
variable type. The designation (MACRO, DELTA, STRUCT, TEXT, and so on) of a
variable level that describes its contents and the use for which it is designated.
virtual memory. A range of addresses that processes use to reference real storage, where
real storage consists of physical memory and disk storage.
volume. A disk drive or a pair of disk drives that forms a mirrored disk.
waited I/O. An operation with an I/O device where the process waits until the
operation finishes. Contrast with nowait I/O.
waiting process. A process that cannot execute until an event occurs, a resource
becomes available, or an interval of time passes.
wall-clock time. The local time of day, including any adjustment for daylight-saving
time.
working set. A collection of DEFINE attributes that have been assigned values.
$CMON. See command-interpreter monitor.
$RECEIVE. A special file name through which a process receives messages from other
processes.
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