Asus K42JB - Manual (Page 8)

 Notebook PC User Manual
A. Slide your finger across the touchpad to move the pointer. You
can also hold the left button and slide your finger to drag the
selected item.
B. Use the left and right buttons like a standard mouse.
C. Use two fingertips to slide up/down/left/right on the touchpad
to scroll a window up/down/left/right.
D. Use two fingers to tap the touchpad. This action simulates the
click on the scroll wheel of a mouse.
E. Use three fingers to tap the touchpad. This action mimics the
right-click function of a mouse.