3way switch on old house

Anonymous's Avatar (by Gravatar) by Anonymous in  Energy » Electrical » Lighting 

one box has 3 wires other box has 2 wires. i made a mistake on earlier post. Found hot wire on the 2 wire box- does that go to common screw? the other box has 2 wires with power and one not-i figure the on that doesn't have power is the common??

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