Trackpad Gesture Program?

I watched a buddy of mine set a trackpad gesture to open applications by pressing lets say "Ctrl+Opt+S" or something like that and then a grid would show up on the screen and you would do the gesture on the trackpad and it would open the application. I've looked all over and can't find it, anyone heard of it.

 

He's at work right now and I wont see them until Mon or Tues NEway.

I was looking for a way to get it right now, if no one knows it's cool I was just wondering.