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playback ([file_name], {overwrite}, [play_now])

     Usage: Plays back or loads a keystroke macro.  The macro must
            have been created by using remember, and can only
            be loaded from a file if it was saved using
            save_keystroke_macro.

Parameters: File_name .string. contains the DOS name of the file to
            load. If no path is given, the BPATH environment is
            searched. The .km extension is assumed if unspecified. If
            file_name is omitted, the keystroke macro in memory is
            played back immediately.  Overwrite .string. is "y" if the
            loaded macro should overwrite the one in memory. The user
            is prompted if overwrite is omitted. Play_now .int. is
            needed only when loading a file, and should be non-0 or
            omitted if the macro should run immediately after
            loading.

   Returns: 0 no keystroke macro to playback
            1 success
           -1 sequence paused or being remembered
           -2 error loading keystroke macro file
           -3 cancelled by user with <Ctl-Break>