Set TRUE to run the TWAIN Source's GUI modal or FALSE to run it modeless. Please note that to successfully run modal, it may be necessary for the application to disable inputs to its windows while the Source’s GUI is running.

'Declaration
 
Public Sub TwainSetModalUI( _
   ByVal ModalUI As Boolean _
) 

public void TwainSetModalUI( 
   bool ModalUI
)

public procedure TwainSetModalUI( 
    ModalUI: Boolean
); 

public function TwainSetModalUI( 
   ModalUI : boolean
);

public: void TwainSetModalUI( 
   bool ModalUI
) 

public:
void TwainSetModalUI( 
   bool ModalUI
)