"The" keyboard and "the" mouse

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http://forums.fedoraforum.org – The thread http://forums.fedoraforum.org/showthread.php?t=282147, which I don't know how to answer, brings up the question of how "the" keyboard and "the" mouse are determined when a system has more than one keyboard and mouse attached to it. The way that I imagine this being done is that kernel doesn't discriminate among input devices and that the "window manager" is the software that needs to know if a device is a keyboard or mouse. Is that correct? And how do programs that set the parameters of a mouse, know which mouse they are dealing with - and is th (HowTos)