custom keyboard or other input device (Score 1)

i've been working on a project that is essentially a custom keyboard, but it only has two keys. my client wants to be able to control his powerpoint presentations from WAY across the room and with high reliability (range and reliability do not lead one to RF or IR remotes). my 2-key podium-mounted keyboard implements the PAGE UP and PAGE DOWN keys on the keyboard and talks to SerialKey in windows over the serial port. works great. find the SerialKey ui in the control panel under accessability options (general tab).