NonStop System Glossary

contiguous ground
An insulated grounding conductor that extends from an equipment enclosure power receptacle to
the final point of electrical service for the computer-room equipment, whether that final point is the
main service entrance or the separately derived power source. In most instances, the final point
of electrical service is an isolating transformer installed in the computer room.
control and inquiry
The aspects of Subsystem Control Facility (SCF) object management related to the state or
configuration of an object. Such aspects include actions that affect the state or configuration of an
object, inquiries about the object, and commands pertaining to the session environment (for
example, commands that set default values for the session).
control domain
Denotes the extent a given maintenance entity is directly accessible to hardware, based on the
internal maintenance bus of the maintenance entity’s FRUs.
controller
See I/O controller or ServerNet addressable controller (SAC).
controlling process
In the Open System Services (OSS) environment, the session leader that established the connection
to the controlling terminal. The session leader stops being the controlling process when the
corresponding terminal stops being the controlling terminal.
controlling terminal
In the Open System Services (OSS) environment, a terminal that might be associated with a session.
A session can have only one controlling terminal, and a controlling terminal can control only one
session at a time. When a session has a controlling terminal, all the following are true:
• Certain character sequences entered from that terminal cause signals to be sent to all processes
in the process groups of that session.
• Certain characters entered from that terminal might receive special treatment.
• Members of background process groups of the session are restricted from certain kinds of
access to the controlling terminal.
Coordinated Universal Time (UTC)
The standard measure of time from the beginning of the current Epoch. UTC is sometimes called
Universal Coordinated Time, CUT, or UCT; the standard appellation is abbreviated as UTC, an
arbitrary ordering of the letters. UTC was formerly called Greenwich mean time (GMT).
core dump file
See process snapshot file or saveabend file.
core file
See process snapshot file or saveabend file.
correctable memory error (CME)
An error caused by incorrect data at a particular memory location. The cause of the error is such
that the error is automatically corrected by the system. Contrast with uncorrectable memory error
(UCME).
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