Kudzu mouse detect

[Bill Nottingham]

Sean Craig (seanc at tech-access.com) said: 
> Why (technically) will the probe 'not work'? 

PS/2 devices have undefined and chipset-specific behavior when
opened by multiple programs simultaneously. If run under X,
there's a very good chance that X has the device open; then
the results will be unreliable, and it can disrupt the mouse
use under XFree86 as well.

Bill