With face to face communication, 「おつかれさまです」 can be used both "internally and externally" except for the morning and can be translated as “Hi” or “Hello”. とはどういう意味ですか?

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Maybe it means that you can use it both in your organization, like in a company or a school and in outside with strangers.
So you can use it wirh strangers as well as colleagues, teachers, bosses, friends.
I'm not sure...but at least I know おつかれさまです is such a common word and we can say to anyone.
If you think my guess is wrong, plz tell me and I'll think other meanings.