what is this HoW everyone talks about?

[MCBoston]

Im new to this forum, and i was just wondering what HoW is.

[Grombag]

Heart Of Winter, is an expansion of the original game. It adds a second major quest to your game.
Trials of the Luremaster (totl) is a second expansion, it can be downloaded freely (legaly) and installed if you have how. This will add another major quest to your game.

[AvatarOfLight]

Correct, some more info here:

Icewind Dale: Heart of Winter - Wikipedia, the free encyclopedia

Wikipedia, use it, cherish it <3