<<In the PA-RISC calling sequence, parameters that are omitted can't
be distinguished from parameters that were passed with a zero value unless
they're at the end of the parameter list.>>


Which brings up an interesting side-issue: are there any intrinsics where
the default value is *not* some form of binary zero? I have no idea, but it
seems like there could be a case where some type of flag value defaults to
something other than zero.

Steve