What's your plan for an active shooter in your ED?

Okay, you're sitting at the desk typing away into the EMR, some dude comes in from triage and starts shooting. What do you do? Does your plan change if you discharged the guy a half hour ago after telling him 5 times that you're not giving him Percocet? Does your plan change if your hospital is a "gun-free zone" like mine? What is your duty to your patients? To your family? Do you try to talk? Do you run and hide? Do you attack? Do you have a "panic button"? Does it work? Are your security... What's your plan for an active shooter in your ED?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums