westman,
I don't think that I made my last post very clear. I don't believe that crews do use TCAS as their sole reference to the aircraft around them, but it is a useful tool to aid in situational awareness. The others of which I know that you are aware obviously come from our friends in ATC, other aircraft transmissions, continual reference to MSA'S etc.
After reading back my post I can see how you may have presumed this of me.
Regards le loup garou
