Table of Contents:

Table of Contents.......................................................................................................2
INTRODUCTION .............................................................................................................. 3
WHAT IS AN OPERATING SYSTEM? ........................................................................... 5
HISTORY OF OPERATING SYSTEMS .......................................................................... 9
WHAT AN OPERATING SYSTEM DOES.................................................................... 13
Process Management .................................................................................................... 13
Memory Management................................................................................................... 19
Disk and File Systems................................................................................................... 23
Networking ................................................................................................................... 24
Security ......................................................................................................................... 25
Internal Security............................................................................................................ 27
External Security.................................................................................................28
Graphical User Interfaces ............................................................................................. 29
Device Drivers .............................................................................................................. 29
Application Interface .................................................................................................... 31
MICROSOFT WINDOWS............................................................................................... 34
MAC OS ................................................................................................... 45
UNIX................................................................................................... 51
LINUX................................................................................................... 54
GNU...................................................................................................... 57
OTHER OPERATING SYSTEMS .................................................................................. 59
INSTALLING AN OPERATING SYSTEM.................................................................... 62
DEFINING THE PROCESSES........................................................................................ 66
Cache............................................................................................................................ 66
Virtual Memory ............................................................................................................ 74
System Resources ......................................................................................................... 76
RAM ............................................................................................................................. 77
Computer Memory........................................................................................................ 84
CONCLUSION....................................................................................................91


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