iPhone Duo’s Outer Display: What Third-Party Apps Can Do There, and What Apple Has Not Said

iPhone Duo carries two displays, and Apple has published detailed specifications for both. What Apple has not published is what an ordinary third-party app, one that has not been rebuilt with the device in mind, is allowed to do on the smaller of the two, the 5.4-inch outer display, when the phone is closed. The Center Stage camera Apple built...