Home Gym Equipment

I have a home gym similar to this one - http://www.fitnessscape.com/Merchant2/graphics/00000002/yukon-wolverine-home-gym.gif

There is one part where you basically hold your self up and pull your legs up (at least that's what I do). I wanted to know if there is a name for that specific equipment and if there are any other exercises I can do with it besides lifting my knees and doing basically air crunches.

Thank you!