How does a pilot screw differ from an air screw on a motorcycle carburetor?

1. A pilot screw is located on the airbox side, while an air screw is on the engine side
2. A pilot screw is adjusted with the engine off, while an air screw is adjusted running
3. A pilot screw controls fuel flow, while an air screw controls air flow into the idle circuit
4. A pilot screw is only found on two-stroke carburetors