Sony VGN-U750P VAIO Read This First Manual page 36

Action Description
Point Push the multi-pointer to place the pointer (2) on an item or object.
Click Press the left button (3) once.
Double-click Press the left button twice.
Right-click Press the right button (4) once. In many applications, this action displays a shortcut menu.
Drag Push the multi-pointer while pressing the left button.
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Using your VAIO computer