Abstract: Permits one program in one address space to obtain access to data in another address space without invoking a supervisor. Each of a plurality of address spaces assigned an Address Space Number (ASN) has an associated set of address translation tables. Addressability to a second address space may be specified by a program if authorized in accordance with the entry of an authority table associated with the second address space, the entry being designated by an authorization index associated with the program.

Abstract: Permits one program in one address space to obtain access to data in another address space or to call a program in another address space without invoking a supervisor, with authorization to use a storage protect key other than that specifically assigned to the program by a supervisor when in a new semi-privileged state. Programs executing in a particular address space have supervisor assigned storage protect key masks permitting the program, when authorized, to utilize a storage protect key other than the one specifically assigned by the supervisor. A second address space can be designated by a program, and when authorized, can cause transfer of data in main memory from one physical location to another associated with the different address space, and two different storage protect keys can be utilized.