00573nam a22002057a 450000500170000001000130001702000210003003500130005103700160006404000120008008200130009210000270010524500710013224600060020326000430020927000460025230000200029865000270031865000220034520170124110205.0  aB-059041  c00.00a817880121  aB-059041  bCen Lib/Ret  aDPLbEN  a005bSHR  aShrivastava, Raj Kumar  aA text book of information technology /cby Raj Kumar Shrivastava   b   bDominant publishers c2001aNew Delhi   a116 A, South anarkalibNew Delhi e110051  a637p.c20cm(Hb)  aInformation technology  aOperating system