VER 

This internal command displays the version number of the operating system on 
the screen. Also shows whether the version was manufactured by IBM (PC-DOS) 
or someone else (MS-DOS). In general, separately purchased programs that will
work with one version of DOS will also work with higher-numbered versions.  
This is NOT true for DOS external commands, which must match their required 
version exactly. See the NEW_TERMS EXTERNAL_COMMANDS topic for a list of the
external commands.

SAMPLE command and output | Comments about the output

  VER
			    This message was displayed on a computer
  PC-DOS Version 4.00       running version 4.01 of DOS.
