Leviton GLW-1463 appears to be ordinary lighted 3-way toggle switch.
This switch is used in a hallway application where more than 1 switch controls a light.
The green screw is for bare ground wire.
There are two brass colored screws for traveler wires, and 1 dark screw for common wire.
If you are replacing another 3-way switch, then note color of each screw on old switch.
Put wire from old dark screw to new dark screw.
The travelers wires can go onto either brass screw.
Open following link for drawing of ordinary 3-way and 4-way circuits
http://waterheatertimer.org/ST01C-program.html#3-wayUpvote the help.
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