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You don't have to, but it is definitely recommended. When you tether your computer to an Apple ID, the registration information is sent to Apple so you can recover your computer's login information remotely, or receive service without knowing or having your computer's serial number handy.

Apple IDs are also used in iTunes to authorize a computer for purchases, including downloads to/from an iOS device such as an iPhone, iPod touch, or iPad, for FaceTime video chat calls, and other Apple-related services and websites.

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14y ago

What else can I help you with?