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[SIC\]SIC LOCK [LockFile]
With no argument, display the list of lock files owned by the current
program session. With a file name as argument, create this file as a
lock file. Attempting to create a lock file which already exists is a
fatal error. Lock files owned by the current program session are im-
plicitely deleted when exiting.
This command is intended to protect some user's resources, e.g. invoking
it in a procedure ensures that this procedure can not be run twice in
the same or in another session.