If you use the iTunes Store, or any other Apple online service such as iCloud, you have an Apple ID. This is the email address associated with your Apple account. I get lots of questions about Apple IDs, and in this week's column I answer a number of them.Related StoriesMac Gems: Can't wait for Mavericks? TotalFinder offers Finder tabs and moreReview: Photo Ninja 1.0 is the dark horse in the Raw converter sweepstakes
