Wider horizons   unit 1 operating systems 1, unit 2 operating systems 2 

 - London  Open University  1988 
 - 34p.  27cm. 
<br/><br/><label>ISBN: </label>0335143407 
<br/><br/><label>Subjects--Topical Terms: </label><br/>SYSTEMS PROGRAMMING<br/>COMPUTER PROGRAMMING PROGRAMS DATA
<br/><br/><label>Dewey Class. No.: </label>005.4  / WID