UltraVNC source code

I'm using ultravnc, I would like modify the ultraVNC-server to block "CTRL-ALT-DEL" and "Win" key.
I downloaded ultraVNC source code, but it's not easy for me.
There is someone that help me???

Thanks

P.S: sorry for my poor English

That's a lot of code to go through... I think you have faster/better success if you post this question on the ultravnc forum itself.