Gosh, how about reviving a Lisp-tradition of using nomenclature specific to computers and architectures -- the same that gave us CAR and CDR. Looking at the PDP-10 instruction set, upon which the venerable MacLisp and Interlisp spent most of their lives, we might arrive at XCT-WHEN. Spelling it as normal people might, how about EXECUTE-WHEN? --Skef