On Sun, Sep 17, 2023 at 08:39:37PM +0000, Seymour J Metz wrote: > You use an IRB for any of > > Obsolete access methods > STIMER with exit > STAI > STAX
VTAM RPL and EXLST exit routines
IBM TCP/IP ?
ICUV/VNCF ? {obsolete?}
UCLA/IPC NOTIFY=INTADR {the slowest IPC notify method}
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