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Files in the BNU spool directories
that have filenames beginning with the characters LCK.
are lock files.
Lock files prevent duplicate conversations and
transfers.
The names have the form:
LCK.system.grade
where system is the name of the remote system and grade is the System-Job-grade being processed. The lock file contains the process ID of the process holding the lock. This process ID remains valid as long as the process is active.