LOL! I knew you'd be the first in line to chastise me! I use the combined session to generate the signals, but the open session charts for execution. Yes, I know I can do it all from the combined chart, but it's an old habit and we all know what they say about those.
But you're right, everyone should be watching the combined chart (especially in the currencies and stocks) as the markets are global and 24 hours.
Erich