Handling keyboard events from programmable keyboards

Question

I have a logiccontrols programmable keyboard. When a key is pressed, it does not send one character, but instead a string of 4. i.e. - 005A, 251A, etc. When I try to override IMessageFilter.PreProcessMessage on the WM_KEYDOWN event I only get the first character. What would be the best way to capture all these characters? Thanks, g33uu