To change the value of flag JFL in processor chID one can call:
CALL JZSETF (chID, JFL, VALUE)
This routine acts only if the flag JFL actually exists
in the processor chID,
ie. if a title JZFL of at least JFL flags has been given.
In case of do-nothing it returns IQUEST(1)=0.
In case of succesful operation it returns 3 values in
IQUEST(1/3) in this order:
1 LFL adr of the flag JFL is IQ(LFL+JFL) 2 NFL length of the flag vector 3 OLD previous content of the changed flag