laptop and mice

[Cort cort@cs.nmt.edu]

I've seen several that let you use a configuration menu to choose between
alt/alt-shift/alt-shift-control mouse-button to emulate a 3rd button but
the most common that I've seen are the ones that make you press both
buttons at once.  I haven't seen many that let you emulate a 3rd button in
anything but software, though.

} I'm considering buying a laptop and would like, of course, to consider
} running plan 9 on it.  But all the machines have one button (apple) or
} two button (windoz) mice built in.  Are there any machines with three
} button mice?  (and supported by plan 9 ?)  Probably not, so the real
} question is what are folks doing to provide the extra mouse button?  I
} know that one could buy an external mouse and carry that around as
} well, but that's not very elegant given that most everything else one might
} want is now built it to the basic machine.  Using the alt, or better, the new
} windows key, as either a third mouse button or a button modifier seems
} better, but...has anyone done this?  Other ideas?