In a press release on Tuesday, Apple says you can let a "guest user" who's not registered to the device try out certain apps and experiences, without needing to set up an account on the device.
Although not explicitly mentioned by Apple, it seems guest users will be able to bypass the headset's Optic ID requirement that unlocks the device upon scanning your iris. Apple doesn't go into too much detail about how this will all work, but the company notes guests may access "some app content, such as large photo attachments, in Messages" while the Settings app is open.
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