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I would like to be able to hide another application's window from the taskbar, without hiding the window itself. Specifically, I want to have several different Web browsers running, visible, available in the Alt+Tab list, but not taking up space on the taskbar. (If anyone's curious why: I've written a dashboard app that uses Vista's DwmRegisterThumbnail APIs to show live previews of several windows at once -- a sort of "picture in picture", if you will. At that point, also having taskbar buttons for those windows seems redundant.) I am aware that changing the other window's style to include WS_EX_TOOLWINDOW will hide it from the taskbar, and I tried this first. But, as expected, it had some side effects I didn't want: the title bar got shorter (not all bad, I guess) and the minimize and maximize buttons went away (not good). I also had to hide and re-show the window to get the taskbar to recognize the change, which caused repainting artifacts when I did it to IE windows. My next thought was that, since windows with owners are hidden from the taskbar by default, maybe I could change the other windows to be owned by mine. But MSDN is pretty clear that "[a]fter creating an owned window, an application cannot transfer ownership of the window to another window." I found this question that's worded similarly to mine, but it's specifically about windows from your own process, where you have complete control over window ownership. Does anyone know of any other ways to hide a taskbar button, that will work for windows from another process? Update: Tormod put me on the right track with ITaskbarList -- it works great. The pinvoke.net page had some errors (wrong GUID, me

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