Pressure: What pressure do I need to set the CO2 beer regulator at?

Pressure: What pressure do I need to set the CO2 beer regulator at? http://www.micromatic.com/beer-questions/pressure-set-beer-regulator-aid-60.html When dispensing keg draft beer, the goal is to keep the CO<span style="font-size: 6pt">2</span> level prescribed by ...