Mouse Support in XFree86 : XF86Config Options : Buttons
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## 5.1. Buttons

This option tells the X server the number of buttons on the mouse. Currently there is no reliable way to automatically detect the correct number. This option is the only means for the X server to obtain it. The default value is three.

Note that if you intend to assign Z axis movement to button events using the `ZAxisMapping` option below, you need to take account of those buttons into `N` too.

    	Buttons N

Mouse Support in XFree86 : XF86Config Options : Buttons
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