Granting users localhost access

[Pam Astor]

How do I grant users, who already have a password, localhost
access?  I don’t want to change their passwords at this time.
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Use video conversation to talk face-to-face with Windows Live Messenger.
http://www.windowslive.com/messenger/connect_your_way.html?ocid=TXT_TAGLM_WL_Refresh_messenger_video_042008