Sony VGC-V3M User Manual page 20

Before using the pointing device
Before attempting to use the pointing device, you must activate it.
To activate the pointing device, proceed as follows:
1 Fold the keyboard out.
2
Turn on the Pointing Device switch (1).
3 Close the lower part of the cover as shown (2).
You can now use the pointing device together with your keyboard.
4
If you only want to use the pointing device, close the cover completely
as shown (3).
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Using your VAIO