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Ken Sims wrote on 10/03/2007 14:10:00:

Unless, of course, I've missed a few messages somewhere...

Yep.  The OP was asking about _removing_ an optional parameter that no 
callers were passing.  (No problem, and the callers don't need to be 
recompiled.)

The part about changing from CONST to VALUE was thrown in by another 
poster.

Actually, I didn't "throw it in".  The original poster, Lim Hock-Chai, 
said:
"I think there are some instances, like changing parameter's "const"
keyword to "value", will cause problem to caller even though the caller
is passing the correct number of parameters."

I was thinking (although inaccurately it would seem) that this would cause 
problems not in the _calling_ program, but only in the _called_ 
subprocedure itself.  I guess if the subprocedure fails, that might count 
as a problem for the calling program, so in retrospect the distinction 
probably isn't that important anyway.  This lead to some discussion about 
how exactly parameter passing works, which although not directly related 
to the problem that Lim Hock-Chai originally mentioned, is probably 
worthwhile and certainly is on-topic for this list.

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