What do the different types of ITaskbarList do?

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So far I've used ITaskbarList and ITaskbarList3 to use the taskbar icon's progress bar; however, I'm curious as to what ITaskbarList2 and ITaskbarList4 are used for?

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Thanks to Raymond, I checked out the MSDN and found that:

  • ITaskbarList2 extends ITaskbarList and adds a method to mark a window as fullscreen
  • ITaskbarList4 extends ITaskbarList3 and adds a method to change the tab properties

So, each ITaskbar# builds upon the previous one.