gadgets

Im asking here because I wasn't sure exactly what to google for.

How do people program things to work will little gadgets in a USB port....example: how does the palm software connect to the cradle? Im sure theres tons of hobby site of people making toys and stuff like this....anyone know if theres much about this?

There is stuff out here about hidio (the USB port driver) programming as well as USB specs.

This is the internet home for USB - it has a forum where you can ask questions as well.

http://www.usb.org/home

http://www.usb.org/forums/developers/webboard.html