Well as you said, if you wanted to either save locations or if you had two of the same doodad/unit at the same spot that you wanted to use disable/enable on, then you would need to specify different players or it wouldn't work correctly (doodad state only works on one doodad/unit in the location of the player or type you specify, so only one would be opened if they were the same player or if the trigger was All Players). Make sense? At least, thats if I remember correctly (hard to trust my memory nowdays, I think I'm getting senial or something... at age 20

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