In case you should ever want to take a screenshot of your iPad or Google Nexus 7 screen, these articles will help:
iPad
http://www.techseeks.com/how-to-take-screen-shot-of-ipad-3.html
Google Nexus 7
http://howto.cnet.com/8301-11310_39-57474203-285/how-to-take-a-screenshot-on-the-nexus-7/