Fudge, English at 5 AM is not my forte. I meant "functioning" rather than "that one that gets mental co-citations with Lisp but whose definition I cannot conve

Fudge, English at 5 AM is not my forte. I meant "functioning" rather than "that one that gets mental co-citations with Lisp but whose definition I cannot conveniently call to mind at present." (n.b. I suspect that there's some business problem you can solve with that, too, but personally I'm pretty pedestrian with regards to programming methodologies.)