Lenovo ThinkPad i Series 1157 ThinkPad 570 User's Reference - Page 64

Using the keyboard functions: TrackPoint - Neither This function disables the scrolling and magnifying glass functions. Choose Scrolling Method Click one of the following radio buttons: - Press Center Button, then use TrackPoint This option enables you to hold down the center click button on the keyboard and then use the TrackPoint to control the scrolling or the magnifying glass. When you are not holding down the center button, the TrackPoint operates normally; that is, it controls the mouse cursor. - Use External Mouse This option sets an externally attached mouse to scroll (or move the magnifying glass) horizontally or vertically. The TrackPoint functions simply as a cursor. - Use TrackPoint This option sets the TrackPoint to scroll horizontally or vertically without your holding down the center button. Use an externally attached mouse as a cursor. You can still use the TrackPoint to control the mouse cursor by pressing the center button. The Use External Mouse and the Use TrackPoint radio buttons are enabled only if a mouse is attached. 48 IBM ThinkPad 570 User's Reference