00326nam a2200121 a 450000500170000002000150001708200200003210000210005224500610007325000110013426000390014530000200018420251203092006.0  a0201509393  a005.43,bD, dei  aDeitel, Harvey M  aIntroduction to Operating systems, Harvey M. Deitel, eng  a2nd ed  aNew York, Addison-Wesley, USc1990  axxv,853p.c20cm