So as I've been working on educating myself on basic preparedness and survival issues, I have come across an interesting assumption in the material I've read:

(Booming Megaphone Voice) YOU MUST LEAVE THE CITY AT ALL COSTS!! REPEAT, FLEE THE CITY AND RETREAT TO YOUR PERSONAL Rural-Bunker (TM), etc..

Well, what do you do if its not possible to leave? Or even if you could, you don't have anywhere to go? Or even if you did get out, traveling to your destination may be more dangerous?

So if you have to stay in your house, townhouse, apartment, etc.. How does that change one's survival strategies? How do you keep it legal when there is no emergency (weapon and carry restrictions within urban areas)? What are the resources that are unique to the urban environment that you should be aware of and/or befriend? What should you carry at all times? (as you won't be at home most of the time). Are there perhaps any specific advantages to staying?