ATX power switches are momentary switches. So they just conduct a circuit for a second (or however long you hold down the switch/button).
Just found out that my new mobo can take an ATX power supply. I want to rig up a SPST switch in the front of my car for one button startup. In the manual, it says to wire the two contacts to an ATX power button. Is this any special button? If so, where the hay can I buy it?! Thanks!