How to dectect when a unit uses an item?

Can someone tell me how... I would be very happy if someone did. :ggani:

It's in the WE, it's under events... just when unit uses (item), do (Actions).

oh sorry i said it wrong I need to could use the point where he uses the item... so you I need a solotion on that or the string order when a unit uses a special item.

...What? I don't follow you...

How do I check the place the unit uses the item on, when I still need to make it only the special item that runs this trigger. It sounds simply but try look at the editor because i can't find a solotion on this.

Have you tried using the ability cast trigger?

I mean I have an another solution but I doubt you'll like it as it has jass.