Hi yao wang,
To get all RadWindows, you should use RadWindowManager's GetWindows() method. Once you have a reference to that Windows object, you can loop trough the windows and get their properties. Since you will be using a FOR cycle, I would suggest not to use getWindowsBounds() with a timeout, but Telerik's static client library
for that purpose.
For convenience I attached a small sample that shows how to get the properties of every RadWindow on a given page (assuming that they are all opened via the same RadWindowManager).
All the best,
the Telerik team
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