Passport SignIn & Multiple Users

Archived from groups: microsoft.public.windowsxp.messenger (More info?)

We have a family PC that is set up with three user accounts (all with
administrative privileges). One account is set up for the grand-daughter who
visits on the weekends. She has set up MSN Messenger with her Passport
sign-in name to access her chat friends while here. This seems to have
defaulted the Passport sign-in to her account under the other user accounts
as well. Isn't this protected under the "Local User" settings so that it
should not interfere with other user accounts?! Must every user insure that
they sign in as a "visitor" on the machine in order to keep from spoiling the
use of it by the other users? How do I fix this?