Example of changing primary and secondary address spaces with subspaces

An application program is running with PASN=SASN=HASN in address space X'23', and has not issued the BSG instruction.

Here are some hypothetical actions and the results of those actions:

Program Action	Result
The program issues a BSG to subspace TP1	The program is running with PASN=SASN=HASN=X'23', and has addressability to subspace TP1 through its primary and secondary address spaces.
The program issues a PC (Program Call) instruction that changes the PASN to X'14'	The program is running with PASN=X'14', SASN=HASN=X'23', and has addressability to subspace TP1 through its secondary address space.
The program issues a SSAR (Set Secondary ASN) instruction that changes SASN to ASID X'18'	The program is running with PASN=X'14', SASN=X'18', HASN=X'23', and does not have addressability to TP1 through either its primary or secondary address spaces.
The program issues a SSAR instruction that changes SASN back to ASID X'23'	The program is running with PASN=X'14', SASN=HASN=X'23', and has addressability to subspace TP1 through its secondary address space.
The program issues a PT (Program Transfer) instruction that changes PASN back to ASID X'23'	The program is now running with PASN=SASN=HASN=X'23' and has addressability to subspace TP1 through its primary and secondary address spaces.
The program issues a BSG instruction using ALET 0	The program is running with PASN=SASN=HASN=X'23' and has full address space addressability.