Thanks George. Yes symbols are wonderful when they represent more than one copy. However, even if I made all of my doors and window into symbols, I would still have 10, 20, 30... different symbols due to the different sizes and configurations.
A global change to a common attribute would still entail modifying many symbols. So while symbols can be a valuable tool, I do not see them as a solution to the stated wishlist topic/problem.
I need/want to be able to be able to select all of my doors & windows and make a global change to a common attribute.