I know it's out there, I talked to somebody that was doing it. Unfortunately I don't know the name of the company that makes the required software to support it properly.
Tempest have what you want: www.tempest.skEmail to Daniel; he was *very* helpful in helping me to get their USB drivers for Sun Ray to work with our Elo Touch monitors.His email is Daniel_Vanco at tempest.sk; I do not know if he is on this list.