VNC.RFBProtocolHandling.RFBProtocolHandler.sendFBUpdateRequest Function
send update request, implicitly tells server, that the last sent update-messages was processed at the client

Private void sendFBUpdateRequest (int, int, int, int, bool)
  Type Name Description  
    int x    
    int y    
    int width    
    int height    
    bool incremental    
  Return Description  
    void