Well...I don't remember using them in either Caché or the previous M/SQL and don't see them documented at all going back to Caché 4.1 (the oldest I can find on InterSystems' site), but a search of current (IRIS 2022) %SYS code suggests $zu(0) is used in database creation (ref in %SYS.DATABASE.int):
CreateDatabase+45 s rc=$zu(0,dir,blksiz,uic,0,expandby,maxfilsiz,$g(gdir,2),$
However I've also seen it like this, not in this system:
Not so sure about $zu(1) but you can find it in GBLOCKCOPY.int and NLSLOAD.int. Tried searching comp.lang.mumps?
Well...I was hoping there was a way to convert this into a never-expire thing, but I am downloading the latest version and will upgrade. Thanks for the feedback!
Sure -- if you have multiple parameters for a function, the corresponding arguments can be passed by separating them by a colon (:), e.g. ZZQD "Queue1":$H-3.
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