Poll with comments: skill tree.

To be 100% sure about a hero’s skill tree, you need to know its number (1-255), which is randomly chosen at the start of the map and cannot be determined directly (only by guessing based on the skills acquired). If you are referring to the LMOracle program, it takes data (the skill tree number, without going into details) that is hidden from the player and retrieves it directly from the game, so its use is technically similar to opening a save file. But it seems to have protection against this and does not allow launching the game online.