photon
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dunno, isn't it the window where you slip in the cardboard end of a film box so you don't forget what you loaded the damn thing with...
Exactly.
If you don't have one, or are running several film cameras (so liable to forget), it's a good idea to weigh the camera as accurately as possible with and without film loaded, taking note of what's fitted to the camera, so you can decide whether or not it's safe to open the back.