window form Application in visual studio

Hi,
I have just found a problem or may be lack of knowledge about windows forms events. So if anyone have solution regarding this problem..Please reply.

I have a form and on the form there is button control, and on its click event it get triggered and start another application like notepad. But the problem is form get lose the focus and notepad get the focus. What I need there, notepad respond to keys but on pressing some special key only form gives respond.