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<google>BUY_IPAD</google>
If you have ever developed an application using a user interface toolkit for a windowing based desktop system (be it Windows, Mac OS X, Linux, Qt or GTK+) you will likely be familiar with the need to design your user interfaces such that they resize appropriately when the user enlarges or reduces the size of a window. This generally involves deciding which visual components of a window move and which ones resize to accommodate the containing window.
