The idea that a smartphone or some other pocket computer that can work on a larger display isn't new. Samsung has tried it with its DeX system and we've seen in in movies and TV plenty of times - like when Iron Man uses his smartphone with a holographic display.
During last week's Google I/O developer conference, Andrii Kulian - a software engineer working on Android's multi-display capability - gave a talk called “Build Apps for Foldable, Multi-Display, and Large-Screen Devices" where he discussed how developers can get apps ready for a multi-display world.
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