[ZORG1986]

triggeraction x,y,action,params;
You wouldnt need any params, the action would be the action name and the x and y would be the x and y location of the NPC the trigger action is directed at.
The NPC on x y would need the command
if (actionname) {actions go here}
name being the name of the action you triggerd
and if its to increase a variable the actions it would need to trigger would be
varialblename+=1;

Now chances are i have completley confused you, cause i have confused myself, and i think i have just decided Im crap at explaining commands, erm someone translate the above into English please, LoL