00272pam a2200121 a 4500020000500000041000500005082000900010100003100019245004000050250000900090260004300099300000800142  c  h  a5.43  aSTALLINGS (Willam)eauthor  aOperating SystemshTextual Document  a2nd   bPrentice Hall of India New Delhic1997  a701