That's the auction broker, not the auction house. There was a thread about this a few days ago which came up with "/bind f6 GenAddWindow Auction_Root" as opening the auction broker, but it still requires any conflicting windows to be closed to work. The literal answer about getting to the AH is to actually go to the AH.
Good question, but what I was wondering was why have the server name in the channel; surely you can only see channels on the server you're on making it redundant.
twas a jest, but if it were a serious question where I'm from would not effect the answer as GMT is GMT whether I'm in Scotland (which I am), Sierra Leon, or on the moon.