While in the Admin screens, the Back button (not the browser Back button, but the Feng Office back button) is on the top left side of the screen.
While in the object views, like Task or Milestone or Document - when you're viewing an object the Close button is on the top right of the screen.
When I want to get back out of a screen, I don't really think about whether it's an object or a screen or a task or a whatever, I just want the "get back to what I was doing" button to be in the same place.
Can Feng Office pick one side or the other?