What do the different types of ITaskbarList do?

Question

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?

Answer 1

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.