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(emacs)Advanced C-x C-q

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Enter node , (file) or (file)node

Advanced Control in `C-x C-q'
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   When you give a prefix argument to `vc-next-action' (`C-u C-x C-q'),
it still performs the next logical version control operation, but
accepts additional arguments to specify precisely how to do the
operation.

   * If the file is modified (or locked), you can specify the version
     number to use for the new version that you check in.  This is one
     way to create a new branch (Note: Branches).

   * If the file is not modified (and unlocked), you can specify the
     version to select; this lets you start working from an older
     version, or on another branch.  If you do not enter any version,
     that takes you to the highest version on the current branch;
     therefore `C-u C-x C-q <RET>' is a convenient way to get the
     latest version of a file from the repository.

   * Instead of the version number, you can also specify the name of a
     version control system.  This is useful when one file is being
     managed with two version control systems at the same time (Note:
     Local Version Control).