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Contains the main program that basic handling the computer..Not all operating systems can work together with other systems..UNICOS  Cray SupercomputerMVS, VM  IBM mainframeVA/VMS  DEC minicomputerWindow  IntelMac OS  Motorola

The main program consists of basic management functions of the computer .
All operating systems can interoperate with other systems .
UNICOS  Cray. Supercomputer
MVS, VM  IBM mainframe
VA / VMS  DEC minicomputer
Window  Intel
Mac OS  Motorola.

Consists of main program serves basic management functions of the computer operating system.
all can work together with other systems.
UNICOS. Cray --- > Supercomputer
MVS VM --- >, IBM mainframe
VA / VMS --- > DEC minicomputer
Window --- > Mac OS --- > Motorola Intel

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