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Converts a screen name or e-mail address to a user value. A "user" is an individual with whom you've shared your application. You'd translate something like an e-mail address into a user value so that QuickBase recognizes the user. When you do so, you can take advantage of user fields to design permissions and/or views. For example, show a user only those tasks that have been assigned to her.
ToUser([Email Address]) takes the values in the Email Address field and returns their corresponding user values. ToUser("jsmith") returns the user with the screen name "jsmith". ToUser("email@example.com") returns the user possessing that e-mail address.