User's guide :  Microsoft MS-DOS 6.21 for the MS-DOS operating system. 
 Microsoft MS-DOS 6.21 for the MS-DOS operating system 

 - xiv, 242 p. :  ill. ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>MS-DOS (Computer file)
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operating systems (Computers)
<br/><br/><label>LC Class. No.: </label>QA76.76.O63  / M489146 1993 
<br/><br/><label>Dewey Class. No.: </label>005.441  / M626