# Transfer drops port2 here; port messages have empty origin

Lesson 5 quiz: A, C, E correct; B and D wrong. B: after you transfer `port2`, this page cannot use that end — same move as transferring a buffer. D: on a port message, `event.origin` is the empty string; the port is the check. The learner already checks `event.origin` on the window (lessons 1 and 3). That habit does not apply to the port. Next “when the port wins” work should keep those two surfaces separate.