You CAN, but once you have dispensed some beer, you will have no way of regulating the pressure, so if it isn't drank all in a day or two, the pressure will start to change, and you may end up with a keg of flat beer. Those things are really just for pushing it through the lines at a picnic, not for maintaining pressure on a keg.
Naturally carbing a keg is basically the same as bottles.
On Tap:Cran Wit, Dr Pepper Dubbel, Cascadian Pale Ale, Dark Chocolate Stout, Imperial Stout, Brown Mild, Schwarzbier
On Board: IIPA