Good news for iPad owners who wanted to share their iPad with friends or family members, this iUsers application should be the software you are looking for. However, it is only available for jailbreak iPad.
Currently, it is not on Cydia yet. However, you can find out how to get it on this link. According to the source, seems that they are trying to incorporate this into future Cydia software. Here is a video on how it works.
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(source)