>As For serialization do You mean the LOCAL LOCK ? No, I do not. I refer to serialization that will prevent the ASCB / ASSB from being freemained if the corresponding address space terminates
That serialization is one of the following -- CMS lock (with any local lock) -- DISP lock (not a programming interface) -- Disablement, but only if you have stayed disabled from the time that you picked up the ASCB address, through the time that you validated with LOCASCB (or something else) that that ASCB is still valid, through accessing ASCBASSB and ASSBSTKN. Peter Relson z/OS Core Technology Design
