I don't know about you, but it's inevitable that DD wants to come over and bang on the keys to my laptop as soon as I pull it out. Problem is, she is constantly changing settings and I don't know how to get them back sometimes. A coworker of mine showed me this app and I can't wait to try it out. http://www.babysmash.com/

It lets your LO smash away at the keys, but prevents them from changing any settings on your computer. Yay!!