Interactive NPC's

[GreeN!X]

I wanted to make every NPC in my map to be interactive and I use Esc to interact with the said NPC's.. The problem is that I don't know how to detect if my hero is near a specific NPC (I have at least 50 of these NPC's) so that I can run some actions like showing some text or sumthing. making it more difficult, NPC's move around the town, so I can't use regions to detect my hero's position.. How show I do this kind of trigger?

 

[Almia]

Try using Select Hero ability or try looking inside this : http://www.hiveworkshop.com/forums/maps-564/aegaeus-221298/?prev=search=aegaeus&d=list&r=20