App monitor keyPress outside the app

Hi,

I have an application which can be hided on a click of a button. Than user can work to different applications. After a while maybe the user wants to have back the hidden app. So basically I want somehow my app to monitor if a combination of keys is pressed than wake up :)

So, when I press on 'Hide' button the the app run in background and when I press Ctrl+Shift+B (let's say for example) may app get focus and it apears on the screen.

Can somebody give me an example? or helping me in my problem?

Thanks

Thanks in advance, Ciprian LUPU