new CheatCode HOWTO?

Can anyone point me in the direction of howto add a new CheatCode to knoppix?

E.g. xeyes=1
This would have user knoppix run xeyes on desktop startup.

(This is obviously not what I'm wanting to achieve, I just thought I would use a simple example).

Or could someone describe how one of the current CheatCodes work?
E.g screen=1280x1024

Thanks for any information.