When your tablet needs a windowed UI, has it crossed some undrawn, implied boundary that makes it too complex for the kinds of casual tasks you’d want to accomplish on a tablet? Hard to say,
The mobile developers at Ixonos introduced a windowed build of Android Tablet at MWC 2011. The system is built atop Android 2.2 aka Froyo and allows apps to continue running in the background. Thus, you can play a video while you composing messages.
Ixonos demonstrated the software (built by Aava ) on a dual-screen 7-inch tablet, allowing apps to be launched on either screen and transferred between them, all without customization needed to individual apps, which is going to be key for a system like this to gain any market traction.
Watch the demo video below.