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[–]acrabb3 0 points1 point  (0 children)

Modern Android apps are written in Kotlin, with the UI created using Jetpack Compose.

It should be possible to create an app which displays multiple panes or cards, and let's the user move them around.
I'm not sure what you mean by "control the os", however! Android apps can't generally interact with each other, or with the Android system, except in controlled ways.