Asus X7DSL - Manual (Page 52)

52 Notebook PC User Manual
Two-finger zooming in/out - Moving two fingertips apart or
together on the touchpad to zoom in or zoom out. This is convenient
when viewing photos or reading documents.
Zoom in Zoom out
Two-finger rotating - Fix one
fingertip on the touchpad and
make an arc with the other to
rotate the photo or the document
you are viewing. You can make
a clockwise or counterclockwise
rotation based on your needs.