Explanation of the VER command. It is INTERNAL.

This command will will show you what version of MS-DOS you
are currently using. 

Example:
       Lets say you are working with MS-DOS 5.0 normally
       but this time not all of the commands work. To see
       if you might be using a different DOS version just
       type:
           ver
       DOS will then respond with the following, where n.nn
       is the version number:
           MS-DOS Version n.nn