source files: [xc]03d.[ch]
(SEND <x03d> :MAYBE-RUN-PER-FRAME-HOOK)
This runs the :PER-FRAME-HOOK code on <x03d> if (and only if) a (:NEXT-FRAME <xcmr>) has been executed since the last time the :PER-FRAME-HOOK was evaluated for this object. If there is no :PER-FRAME-HOOK value on <x03d>, this message has no effect.