Oh goodie!

Flying into ATL on Sunday for the first time and was afraid I wouldn't be able to get into neither E nor F (I DO need a shower after a transatlantic flight and if only as a courtesy to the other people) because I transfer to a domestic flight.

So I did understand this correctly: no matter where I go (even with a domestic ticket) within the airport I could technically always go back and forth to the E or F Club even if I, let's say, went to Concourse A first?

I'm relatively new to this but have learned to appreciate lounges, lately...

Edit:
Up to now I've only been to Lufthansa lounges. Is there anything particular as far as etiquette is concerned I should keep in mind at the Sky Club (e.g. what's free at the bar and what isn't) - I just absolutely hate acting inappropriately in an environment like that.