I've discovered the meetup Wikis and love the idea of sharing my lounge access from my MileagePlus Club card. I fly Lufthansa often and would share my access, but I don't quite understand the Lufthansa meet-up wiki. I know about the Schengen treaty, but why are people identifying Schengen or non-Schengen with their lounge availability?

I'm sure it's been asked a million times. Thanks in advance.