Explanation of the GOTO command. It is a BATCH command.

This command tells the batch file to go to a certain
label in the batch file, and possibly skip a part of 
the program.

Example:
       To let your batch file skip something and go on 
       somewhere else use this type of command in your BAT file:
              Echo off
              format a: /s
              if not errorlevel 1 GOTO end
              echo An error ocurred during formatting
              :end
              echo End of batch prog.