Samsung XE500T1C-K01US 用户手册

This function is the same as the scroll area of the Touchpad.
If you place two fingers over the Touchpad and move them up, 

down, left or right, the screen is scrolled up, down, left or right 

accordingly.

or

If you place two fingers over the Touchpad together or apart, the 

current image or text is zoomed in or out.

Zoom-out

Zoom-in