I am using the USB cable which is attached with the HDMI cable for a presentation I connect HDMI cable in HDMI Port in laptop & USB plug in the USB port in the laptop .but what happening presentation is being done on dx80 but i am not able to do on dx 80 like I want the touch screen.
The DX80s screen does not act as a touch screen with any connected PC. The touch screen is soley for control of the DX80, not any connected device.
Wayne is 100% correct - so you are wondering what is the purpose of the USB cable attached to the HDMI cable? Early DX70/80's ran android based OS's, with those you had the ability to access files on your laptop from the DX via the USB connection. With CE code there is no reason to connect the USB cable, it serves no purpose.