I just linked the forum account I use primarily (Cornfed) and swapped to that account, it displayed Cornfed in the upper right.

Posted on this thread: http://www.earthempires.com/...type-help-windows-7-27378
And it displayed the poster as the account I only had been using for bonuses (Bobonthis).

Edit: And again it shows Bobonthis here. If I bring up the menu in the upper right, under Switch to Handle, it lists Bobonthis.

Edit #2: If you look at the forum overview, it says last poster for the threads (the linked one and this one) as Cornfed.