FUNCTION RegisterDoDriverIO(VAR theID: IOCommandID; thePB: ParmBlkPtr; returnAddr: IOCompleteEntryPointPtr): OSErr; C;
FUNCTION IOCommandIsComplete(theID: IOCommandID; theResult: OSErr): OSErr; C;
FUNCTION GetIOCommandInfo(theID: IOCommandID; VAR theContents: IOCommandContents; VAR theCommand: IOCommandCode; VAR theKind: IOCommandKind): OSErr; C;