TACL Reference Manual

Glossary
HP NonStop TACL Reference Manual—429513-018
Glossary-5
home terminal.
home terminal. The terminal whose name is returned by a call to the MYTERM procedure,
or the name returned in the hometerm parameter of the PROCESS_GETINFO_
procedure. The home terminal is often the terminal from which the process or
process’s ancestor was started.
interprocess communication (IPC). The exchange of messages between processes in a
system or network. interrupt. The mechanism by which a processor module is notified
of an asynchronous event that requires immediate processing.
invoke. A request to execute TACL code. To invoke a variable, (1) list its name (like an
implied RUN statement) without regard to results or (2) surround the variable name in
square brackets ([]) to replace the name with its expansion (text or macro variable) or
results (routine).
IPC. See interprocess communication (IPC).
job ancestor. A process that is notified when a process that is part of a job is deleted. The
job ancestor of a process is the process that created the job to which the process
belongs.
Julian timestamp. The number of microseconds since midnight January 1, 4713 B.C. at
the Greenwich meridian.
LCT. See local civil time (LCT).
LDEV. See logical device (LDEV).
level. One element of the set of values stored in a stack and known as a variable.
local civil time (LCT). Wall-clock time in the current time zone, including any
compensation for daylight-saving time.
local standard time (LST). The time of day in the local time zone excluding any
compensation made for daylight-saving time.
logical device (LDEV). (1) An addressable device, independent of its physical
environment. Portions of the same logical device can be located in different physical
devices, or several logical devices or parts of logical devices can be located in one
physical device. (2) A process that can be accessed as if it were an I/O device; for
example, the operator process is logical device LDEVOPR.
logical device number. A number that identifies a configured logical device. A logical
device number can be used instead of a device file name when opening a device file.
logical processor. The combination of equivalent processor elements in the processor
slices that are running in the same instruction stream in loose lock-step.
LST. See local standard time (LST).