Keyboard Encoder - which key?

I am flying FS 2002, and am building a "flight panel" to get rid of the oversized keyboard.
I have a Hagstrom Electronics KE USB 36 encoder module which works very well. Trouble is, it changes switch movements and turns them into keyboard input ... which is fine, but can't find any keyboard commands relating to Taxi Lights, Beacon Lighs, or Nav lights.
Can someone explain how I can add these commands, the syntax to use, and what file the configuration is?
Thanks for reading this.
I have a Hagstrom Electronics KE USB 36 encoder module which works very well. Trouble is, it changes switch movements and turns them into keyboard input ... which is fine, but can't find any keyboard commands relating to Taxi Lights, Beacon Lighs, or Nav lights.
Can someone explain how I can add these commands, the syntax to use, and what file the configuration is?
Thanks for reading this.