HP (Hewlett-Packard) C2K79UA#ABA ユーザーズマニュアル

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Tapping 
To make an on-screen selection, use the tap function.
Use one finger to tap an object on the screen to make a selection. Double-tap an item to open it.
NOTE:
 Press and hold your finger on an object to open a help screen that provides
information about the object.
Pinching/stretching
Pinching and stretching allows you to zoom out or in on images or text.
Zoom in by placing two fingers together on the display and then move your fingers apart.
Zoom out by placing two fingers apart on the display and then move your fingers together.
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Chapter 5   Navigating using touch gestures, pointing devices and the keyboard