When the neutral wire goes to the switch
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USE THE 'ODD' COLORED SCREW---THE 'LIKE' COLORED SCREWS ARE USED FOR THE 'SWITCH LEGS' OR 'TRAVELERS'.
You seem to be referring about a 3 way lighting circuit. If the cross over switch is replaced with a double pole switch, depending on how the switch was wired into the circuit, the load lamp would either stay on or not light at all. A circuit in a three way configuration has two traveler legs between the two switches The intermediate switch in the circuit just switches the two traveler legs from open to close depending on the position of the other two switched. Google, three way switching, they have many diagrams to work from.
A normally closed switch is a switch that is normally closed. When you operate it, it opens.
Push-To-Make switch is a switch in which pressure is applied to the switch for it to let the electricl current flow through.
To control a light with a switch, the switch has to be connected in series with the light fixture.