TY  - GEN
TI  - Wider horizons : unit 1 operating systems 1, unit 2 operating systems 2
SN  - 0335143407
U1  - 005.4 
PY  - 1988///
CY  - London
PB  - Open University
KW  - SYSTEMS PROGRAMMING
KW  - COMPUTER PROGRAMMING PROGRAMS DATA
ER  -