User`s manual

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6. To switch to different camera view, select menu and select the channel.
7. The JavaViewer support PTZ control function. If the camera has
enabled PTZ function, the camera name has a word PTZ. Using
button 2 to move PTZ camera up, 8 to move down, 4 to move to left, 6
to move to right, 7 to zoom in, 9 to zoom out, 1 to focus in, and 3 to
focus out. User also can refer to Help file for detail function control key.
Select menu and go the way down to select the Help file.