=?iso-8859-1?Q?3=C1=E4mouse?= in xfree86 4.0.2..........

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How to make xserver-xfree86 4.0.2 to emulate 3 button for
a 2 button mouse?
�p��������ƹ��b xserver-xfree86 4.0.2 �U�����T��ƹ�?
Thanx!!!