Samsung T1900 - Manual (Page 22)

Chapter 3: Operation
16
Number Function
3 The button is similar to the middle button on a mouse, which is
used to control the scrolling action.
a. Press this button once, and a scrolling icon appears,
indicating that you have entered the scrolling mode.
b. Use the touchpad to scroll through a web page or
document.
c. To quit the scrolling mode, press any touchpad button,
and the scrolling icon disappears.
Onscreen Display Operation
1. LCD membrane