When you specify AFFINTY=SYSTEM, the system interest for the memory object identified by the USERTKN parameter is removed. The shared memory object will be freed when there is no remaining interest in the object.

The following example frees the system interest:

IARV64 REQUEST=DETACH,
       AFFINITY=SYSTEM,
       COND=YES,
       MATCH=SINGLE,
       MEMOBJSTART=VIRT64_ADDR,
       USERTKN=USERTOKEN
VIRT64_ADDR   DS AD
USERTOKEN     DC XL8'E2C8C1D9E3D6D2D5'     Value is SHARTOKN