There's usually a supply, a primary, and a secondary tank. Not necessarily located in one place. Sometimes primary and secondary look like one tank but are actually two tanks end to end.
To use air tools you have to run the engine. You also have to have a decent sized hose from tank to tool to avoid restricted flow.
2007 Damon 3060-Ford 16k, Ford C-Max Toad, Ford Ranger Toad, Kawasaki VX300 Versys Motorcycle