> OK. Can't figure out how to execute the change function 
> inside an I-desc.
> 
> I'm trying to do:  CHANGE(@ID,"X","(X)")

I wrote & catalogued:

UTIL.BP CHANGE

01: FUNCTION CHANGE( EXPRESSION, SUBSTRING, REPLACEMENT, OCCURRENCE,
BEGIN )
02: RETURN ( CHANGE( EXPRESSION, SUBSTRING, REPLACEMENT, OCCURRENCE,
BEGIN ) )
03: ND

>From an I-desc:

01: I
02: SUBR( '*CHANGE', @ID, "X", "(X)", '' )
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