Computer-Turret

Thanks ^.^

There are a bunch of ways to do it. You can make sure the hero/player is within a certain distance of the object AND press "A" for something to happen (IE: show some text describing the object, or a panel opening chat options with an NPC, it's all up to you).

To check if you are within the set distance you could use hittest or simply compare the X,Y coords of both.
EX: In your event listener for a key press (if using AS2/3 or just your onPress or whatever ever AS1 uses, it's old and I forget exactly)

/*make sure hero's x and y values are between the objects x and y values plus or minus 50 pixels, can change value to anything. Must also be pressing the A key.*/
if(hero.x>object.x-50 & hero.x<object.x+50 && hero.y>object.y-50 && hero.y<object.y+50 && e.keyCode==64){
/*just an example of displaying a description (showDescription is a dynamic textbox on the stage) returned from a getDescription method in the object's class, you'd obv not do this if you aren't familiar with object orient programming but the idea is the same*/
showDescription.text=object.getDescription();
}

I could make an example to demonstrate further if needed.