In OS 2200 each subsystem has its own set of banks that reside in a separate part of the address space that can not be directly accessed by any user program .
It is code and data that may be shared among all programs running in the system .
In code   each subsystem has code 's own set of banks that reside in a separate part of the address space that can not be directly accessed by any user program .
It is code and data that may be shared among all programs running in the system .