Was it any of these?
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Aha, yeah, it was the search gui that popped up. I must have somehow clicked the chat and opened the search pane by mistake. I didn't notice it was the global chat either. Thanks for pointing it out.
I was just playing along today, when suddenly some window I've never seen in almost 3 years of playing pops up with several custom chat channels in it, such as Freedom Badge, Freedom Events, RF2009, and a few others I didn't pay attention to. It almost looked like the character search window. The wierd part is that I didn't type anything in, and I have default binds for the left part of my keyboard. I may have hit some button combination by mistake and caused it to pop up, but for the life of me I cannot find anything related on the Wiki or searching through this forum up to 3 years ago.
Now for the actual question: is there a command to bring up the list again?