Sony pcg-grt715e ユーザーズマニュアル

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To connect a USB mouse, proceed as follows:

Choose the USB connector you prefer to use (at the back of the notebook (1) or the optional port 
replicator).

Plug the USB mouse cable (2) into the USB connector.
You can use your USB mouse (3).

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  The VAIO USB mouse software driver is preinstalled on your notebook, therefore, you only need to plug the USB mouse into the USB connector and 
you can start working.