mouse and trackball - xp?

[big daddy]

I've read around and seen comments that you can't have 2 mouse devices in XP.  I have a happs trackball and oscar spinner with PS2/USB connector.  Can I have both hooked up (through USB for instance) and working as long as I don't need both in the same game? (i.e. use the trackball for golden tee and the spinner for tempest)?  Can I do this with straight USB connections (no need for an optipac or similar?)

I'm having some problems with my spinner and it used to work ok and wondering if it's somehow related to this XP issue or if it's actually something wrong with it.   Trying to elminate the first before I jump into the second. 

[Tiger-Heli]

Mouse and spinner should work fine together in either Win98 or XP.  They will both move the same cursor, though.

In MAME, if you need to split them out (so you can use one for each player) there are several variants that can handle it.  I cover most of them here: http://www.mameworld.net/tigerheli/encoder/main.htm#Optical_Interfaces