Sony PCG-VX88 - Manual (Page 60)

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You can use an optional Sony USB mouse such as the PCGA-UMS1 series
(optional) with this notebook. Since the USB mouse software driver is
preinstalled in the notebook, you simply plug the USB mouse into the USB port
to use it. One USB port supports one USB device.
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See the manual that came with your mouse or keyboard for more information on its
installation and use.