[Help] Making Popup in Client

Anyone know how to make popup page when someone leave the game it's open....

Like when someone in real conquer leave the game it go to the official game website

How do i do that in my client?

modify conquer.exe... Nulls loader for example has a website in the loader set file which opens when the client is shut down.

yea sounds great to set file open when the client shutdown and i will modify conquer.exe with ollydbg thanks alot for telling me the idea