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## 9. Using two mice

In some cases, for instance a laptop with a built-in pointing device, you may wish to use a serial mouse as a second device. In most cases the built-in device uses the PS/2 protocol, and can be ignored if you don't wish to use it. Simply configure gpm or X to use `/dev/ttyS0` (or whatever) as usual.

To use both at once, you can use `gpm -M` to re-export the devices. More details in the gpm man page. Also, XFree 3.3.1 and later support muliple input devices, using the XInput mechanism. Auto-generated XF86Config files should have the necessary comments in them.

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