Quick easy question

There will be no pin where it indicates "key". In a Molex type header connector, the pin will be missing and a plug will be in the mating side housing.

http://i451.photobucket.com/albums/qq236/aggielandman09/Defender PCB Boards/DefenderPCBBoards003.jpg

With an edge connector, a slot will be sawed out of the board and the mating connector will have a plastic "filler plug" in that position.

http://www.electrojumble.org/CON_VERO-10659-2.jpg

Keeps them from be'n put on wrong. Idiot proofing I guess. Absent minded proof in my case...
 
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