While this is more an MVS question (because: Common say subpool 241 ...) another suggestion which might be as good.
Have you considered key 9. Key nine is the free_for_all storage when the "storage protection override" bit is on. That particular bit is on for z/VSE and z/OS all the time. so ... And yes I know that this is not what you asked for - but since there is nothing of the background at all, this might be a new option. - Martin Pi_cap_CPU - all you ever need around MWLC/SCRT/CMT in z/VSE more at http://www.picapcpu.de
