File Locking and unlocking

[bstull]

Problem:
When a lock is issued for a file, all revisions of the file
are lock.  When I try to unlock it, I get the error message that 
multiple revisions are locked please specify one.  I have found
no docummentation that has a unlock command, only the
admin "-l" command for locking.  Is there a unlock command,
and what is it?

Bill