
it reaches the target and "interacts"), but will not otherwise change direction or stop moving unless manually interrupted. Your character will automatically stop moving if the action is performed (i.e. When combined with Click to Move, Interact with Target will also cause your character to face and move toward your target This is an important feature for multiboxing, since it means less manual movement when doing the above activities.

Interact with Target (IWT) is a configurable World of Warcraft hotkey. Finding the Interact with Target hotkey in WoW's in-game Key Bindings window
