Let's say user1 can't remember the spelling of user2's nickname. How does he/she easily find out? Can this be done while staying on the conversation page or does user1 have to start up a new tab/browser window to search the memberlist? Is there a recommended way to add multiple participants to the participants list? Is there anything built into the forum software that checks if a username is valid during text entry into "Participants"? Any warning that a username doesn't exist? What happens if an incorrect username is added?