Windows Messenger question...

I’ve got Windows XP Pro running on my desktop. Everytime someone logs onto Windows Messenger, their name remains in the Username field. Now that list is kinda full, and it’s becoming a pain scrolling down to get to my name. Is there any way to get rid of the non necessary names?

Also, whenever I get online (I have dial-up), windows messenger automatically connects to the net with the name at the top of the list, or somewhere there. Is there any way to stop that from happening?

Bumping this up… really need help!!