Event: Unit acquires a target

Sorry I'm not at the WE so I can't check. Even if I could I still would have a few questions...

First, is there an event for when a unit acquires a new enemy target?

If such an event exists does it only work for your hero when you tell it to attack a specific unit or will the target be set by any enemy in aggro range?

Is this event the SAME as unit is attacked or does this occur before the attack?

There is such an event, it is under the specific unit events. The trigger fires when a unit comes in range and the unit is about to attack it.

Argh, I hate specific unit events...they need to make these generic unit events.