By eHow Computers Editor
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Enabling "Fast User Switching" on your Mac allows more than one user to be logged in simultaneously. This way, if you're working on a word processing document and your family member or co-worker needs to check for email messages, you can switch to the other user's account with a simple click. And when the other person is finished checking his email, you will find your word-processing document precisely where you left it after switching back, again with another touch of a button.