this Little program measures and displays the sample rate of a mouse. the sample rate (in Hz) tells how often (per second) the mouse sends information to your computer.
there are some utilities to change the sample rate of ps/2 mice (the sample rate of serial and usb mice can't be changed afaik). this program is useful to verify the effects of these programs. you find a collection of these utilities e.g. on the mouse resouce page of blue's news, a very good 3d game related news site.
the standard sample rate of serial mice is 40Hz, ps/2 mice are also sampled with 40Hz on windows 95/98 but with 60Hz on windows nt. mice with usb interface are sampled 125 times/sec, but unfortunately they only work with windows 98 and windows 2000.