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(emacs)VC with Locking

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Basic Version Control with Locking
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   If locking is used for the file (as with SCCS, and RCS in its default
mode), `C-x C-q' can either lock a file or check it in:

   * If the file is not locked, `C-x C-q' locks it, and makes it
     writable so that you can change it.

   * If the file is locked by you, and contains changes, `C-x C-q'
     checks in the changes.  In order to do this, it first reads the
     log entry for the new version.  Note: Log Buffer.

   * If the file is locked by you, but you have not changed it since you
     locked it, `C-x C-q' releases the lock and makes the file read-only
     again.

   * If the file is locked by some other user, `C-x C-q' asks you
     whether you want to "steal the lock" from that user.  If you say
     yes, the file becomes locked by you, but a message is sent to the
     person who had formerly locked the file, to inform him of what has
     happened.

   These rules also apply when you use CVS in locking mode, except that
there is no such thing as stealing a lock.