HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

To scroll through artifacts in the hero window, you can keep the mouse cursor anywhere (since there's nothing else to scroll in that window). To scroll through towns in the adventure map window, you need to hover the mouse over the town list area. Similarly, you need to hover the cursor over the backpack area to scroll through artifacts in the hero-to-hero exchange window.
That's how it works for now.
In the future, I'll add scrolling for towns in the town window, the backpack in the merchant window, and heroes in the adventure map window when the vertical resolution is less than 664 (e.g., at 800x600). And maybe in other places as well.