Duck and Cover

Is it possible to talk to a guy and make him open the door if you have clearence??
For example.
You want to get through a door which is locked and gurded, to get through it you need to hava a Id Pass or something. You talk to him and he sees that you have it(its in youe inventory) and opens it. And the door lockes again so you have to show it again the next time you go through it.
Does anyone know if this is possible?

Yes and its very easily done. I've also had NPC's who stand in an opening or in front of stairs so you can't pass. They will only move if you perform some action or kill them.

And how do I do this, I dont seem to figure out how :cry:
Or is there any maps which has this event?

You'll need to set up the pass in the entity editor with a tag name and then use the trigger conditions to see if your character is carrying it. Easiest thing to do is check out JJ86's Quartz map, look at the triggers for getting into the mayors office for buying the pardon and the triggers for using the pardon to free the mechanic. In fact JimmyJay used this type of trigger alot in Quartz : )