Open Source Clickers?

Some good comments about clickers and educational feedback. It is not clear just what the person looking for the OS clicker is really looking for here.

Slashdot | Building an Open Source “Clicker”?
The problem is this: a clicker system requires…clickers. What I need are remote controls that have a minimum of 6 buttons (for users to select options with). The sticking point comes when a button is pressed — the remote must send the option choice, as well as a unique ID specific to the remote, so the clicker software can distinguish between different students.