The Mac, Windows and Linux operating system allows many accounts to concurrent access on one computer, but this coolest and useful feature doesn't work with tablets and phones, like iPad. With Google's Android Jelly Been 4.2 update, you are able to get multiple user account switching on Nexus 10 and 7 tablets.
Android 4.2 offers customized apps and data for each user. Everyone has their own home screen, apps, widgets, background, widgets, and games. The system saves the levels and scores of accounts. If one user has already downloaded an app, another could get instantly have its .apk file, without re-downloading anything.
This is a good solution while you are sharing a single tablet with multiple people in the family or in office.