This method find out if TWAIN is installed on the system. It takes a little time on the first call.

'Declaration
 
Public Function TwainIsAvailable() As Boolean

public bool TwainIsAvailable()

public function TwainIsAvailable(): Boolean; 

public function TwainIsAvailable() : boolean;

public: bool TwainIsAvailable(); 

public:
bool TwainIsAvailable();