Establishing addressability to a subspace

Before a program can run in a subspace, the server program must add a subspace entry to the DU-AL of the task that the program is running under. To do this, code the ALESERV macro with the ADD parameter, supplying the STOKEN that the system returned from the IARSUBSP CREATE request.

The requirements for the ALESERV request are:

The subspace entry must be added as a public entry. If you attempt to add it as a private entry, you will receive a return code indicating an error from the ALESERV macro.
The subspace entry must be added to the DU-AL. If you attempt to add a subspace entry to the PASN-AL, you'll receive a return code indicating an error from the ALESERV macro.

The ALESERV macro returns an ALET. Do not modify this ALET. Use the ALET as an operand on the BSG instruction to switch to a subspace.