Well, depending on whose "typical" you use. I would say 160 packets/sec should be plenty. Sun mice are normally 1200 baud (ie, 120 data bytes per sec) and are either three or five bytes per sample, depending on which protocol the mouse in question speaks - hence, 40 or 24 samples/sec max, depending on the protocol. Some Sun mice can be fairly trivially jiggered to run at 9600 baud instead of 1200 baud; with matching software hackery, you can get a *much* more responsive mouse (at the price of more CPU time spent handling it). I've done this with one of my mice and it produces a very much snappier feel to interactive mouse use (max 320 or 192 samples/sec depending on protocol - I haven't checked which protocol that mouse uses). /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B