Flick; Rotate; Pinch; Using The Trackball - HTC MAGIC User Manual

4 Phone Basics
Drag
Press and hold your finger with some pressure before you start to drag. While
dragging, do not release your finger until you have reached the target position.

Flick

Flicking the screen is similar to swiping, except that you need to swipe your finger
in light, quicker strokes. This finger gesture is always in a vertical direction, such as
when flicking the contacts or message list.

Rotate

For most screens, you can automatically change the screen orientation from
portrait to landscape by turning the phone sideways. When entering text, you can
turn the phone sideways to bring up a bigger keyboard. Refer to Chapter 4 for more
details.
Note The Orientation check box in HOME > MENU > Settings > Sound & display needs
to be selected for the screen orientation to automatically change.

Pinch

For some applications, like Albums or Browser, you can "pinch" the screen using
 fingers (for example, thumb and index fingers) to zoom in or zoom out when
viewing a picture or a Web page.

Using the Trackball

Roll or press the TRACKBALL to select or highlight items on the screen. The
TRACKBALL also flashes when you receive an incoming call or a notification.