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My suggestion is as follows: Make a 3D matrix (a tabbed set of tables would probably be best from a GUI standpoint) wherein a user can customize precisely which Screens, Desktops and Activities a window should be visible in.

Use case: in several of my Activities I like to keep an IM or email application fullscreen, they share the same Screen using different Desktops but in a combined "Communication" Activity I would like to have these exist on separate Screens but on the same Desktop.
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