I would also suggest looking at Auto Hotkey: http://www.autohotkey.com/. If all you're after is sending a window to front on key-press then you may find it faster to learn AHK and write a script to do so (be only 1 or 2 lines) than writing something in C# or VB.
*edit*As regards pressing a button automatically, if it's set as the default button then you can just send the enter keystroke to it. Otherwise you may need to send a mouse click even to the window. Neither is particularly difficult once you have the first part done.
#W::MsgBox "This is a message box. You just need to use something like send to send keystrokes and other commands to the window you want to control, instead of the this message box."
