This is the simplest way, seriously. No fancy stuff, just plain down and dirty. Make an event. Have the event graphic be a closed door. Have the trigger condition be "Action Key". From this point on, I'm just going to assume you use 2k3, like me. When you activate this event, make it wait about 1 or 2 seconds (1 is usually long enough to turn a doorknob, but sometimes it'll take two. Time yourself and friends and use the average for optimum results.) Then make it flip a switch entitled OpenDoor1 to On. Make a new page. For this page, set the Trigger Condition to AutoStart, BUT, it only activates if switch OpenDoor1 is On. Then put the Event Graphic to an open door. You now have a door opening event. Congrats.