Question

________ is a signal user operating system
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Answer 1

OpenVMS is a single user operating system..

Answer 2

HERE IS YOUR ANSWER MATE......;

Signals are a limited form of inter-process communication (IPC), typically used in Unix, Unix-like, and other POSIX-compliant operating systems. A signal is an asynchronous notification sent to a process or to a specific thread within the same process in order to notify it of an event that occurred.

HOPE ITS HELPFUL.....:-)