FLOW CONTROL (BATCH BRANCHING) under CHOOSE

    The power of  CHOOSE  results from the ability  to change the course  of
    execution within batch streams via menu selections.   DOS's "ERRORLEVEL"
    is used to effect branching within a batch file.

    Whenever a menu selection is made, CHOOSE sets the ERRORLEVEL as follows
    and exits to DOS.

                ERRORLEVEL=3      THIRD to LAST menu selection made
                ERRORLEVEL=2      SECOND to LAST menu selection made
                ERRORLEVEL=1      LAST menu selection made
                ERRORLEVEL=0      ESCAPE struck

    BATCH's  "IF ERRORLEVEL="  sub-commands are used following each  CHOOSE
    line to cause the appropriate branching in control flow as shown below.

              CHOOSE *** MAIN MENU ***^Windows^WordPerfect^Backup
              IF ERRORLEVEL=3 GOTO :WINDOWS
              IF ERRORLEVEL=2 GOTO :WORD_PROC
              IF ERRORLEVEL=1 GOTO :TAPE_BACKUP
              GOTO :ESC_STRUCK