drewbagel423,
Our boards just take the motion of the trackball, spinner, etc. wheel and turn it into electrical pulses. To turn that into onscreen movement you will need some kind of interface board between our board and the computer, such as an optipac (ultimarc), an optiwiz (groovy game gear), or even a hacked mouse board (homemade).
Our board goes inside the trackball/spinner/steering wheel to replace the original optical boards if they are broken, etc. You still need another board between ours and the PC to turn it into mouse movement.
Hope that helps a little,
fixumdude