Thanks, Skye. I think this is exactly what I was looking for. One clarification
EXISTS:A:$$EXISTSMOD=EXISTS
EXISTS:A:$$OBJCODE=ACSRUL
EXISTS:A:accessorID=PUBLIC
EXISTS:A:securityObjID=FIELD:ID
In line #3 (EXISTS:A:accessorID=PUBLIC) is PUBLIC the same as SHARED SYSTEM WIDE?