TSGL: deleting from address (?) bar

[Sylvia Gould]

Windows XP Home edition

Not sure what it's called-- the drop-down menu space at the bottom that 
says "address" and retains the web site addresses you've been to....
How do I delete from that list? I have people use my computer to check 
their email, and other things I'm not interested in keeping, but I seem to 
get stuck with all those addresses, making it hard to find the ones I do 
want to keep.
Thanks.