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I use it specifically for taking screenshots of a specific area of the screen, and you can also immediately upload the screenshot to the server and edit it a bit directly in the program. It doesn't allow you to screenshot a specific window, or at least I haven't found how.
Added after 23 hours and 11 minutes
There is a patch for SoD that allows you to remove "unnecessary" or extra objects, such as keymaster tents and cartographers. Will such functionality appear in HoMM?