Phidgets
We have not controlled any other devices excepts mouse, keyboard, camera, sound devices and display from flash but Phidgets is for controls and sensing using USB from PC. There is Actionscript library controls Phidgets. I will introduce this for a few months from August because My kit is coming in a few days.
Multiple Users using phidgets webservice client controls multiple USB devices remotely. The server can be also controlled from MACOSX.
Green:Hardware Blue:Software