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

[+] All (!) original "not me" bugs have been fixed, which allowed players to obtain 'extra' information about the opponent in online play.

[+] An option "Fix gameplay bugs" has been added to HiRez.ini.

If the option is enabled, you cannot peek at your opponent or sell artifacts at an inflated price. But you can find out if this option is enabled for your opponent:
In the main screen of the adventure manager, press [F2], a request will be sent to your opponents, and a message will appear in the chat: "[request was sent]". If your opponent (e.g., BLUE) has HD 2.58 (or higher) installed and the bug-fixing option is also enabled, you will receive confirmation from them: "[BLUE - Ok (2.58)]". If the opponent has the option disabled, or is using an earlier version of HD, or is not using HD at all, you will not receive confirmation from them.

If the option is disabled (on your side), you can peek at your opponent and use the bug to sell artifacts at an inflated price.

[+] (test mode) An option "No wait playing sounds" has been added to HiRez.ini, which allows you to play with "parallelized" sounds, which noticeably speeds up the entire game if you play with sounds enabled.