Selecting A Scrolling Method - IBM TrackPoint USB Space Saver Keyboardwith Hub User Manual

change the size of the Magnifying Glass, hold down the center button, and
press the right button. To change the magnifying power, hold down the
center button, and press the left button.

Selecting a scrolling method

If you enable Scrolling, you must select one of the following scrolling methods
on the Scrolling page.
v Press Center Button, then use TrackPoint
When this scrolling method is selected, you can scroll by pressing the center
button and moving the TrackPoint stick.
v Use External Mouse
When this scrolling method is selected, you can scroll with an external
mouse.
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TrackPoint USB Space Saver Keyboard with Hub: User's Guide