The procedure for a program in the target address space is as follows:

1. Wait (using the WAIT macro) for the accessing address space to place the AX (to be used as the EAX) into the common area.
2. Change to supervisor state to invoke the cross memory macros.
3. Retrieve the AX value that the accessing address space passed and issue the ATSET macro to set the authority table.
4. Notify (using the POST macro) the accessing address space that the authority table is set.

   This action tells the accessing address space that a program can successfully issue the ALESERV macro.