Google Nexus One User Manual page 169

Google Talk
To return to your Friends list
You can return to your Friends list when chatting with a friend, so that you can invite
another friend to chat, add a friend, and so on.
S Press Menu
To sign out of Google Talk
You can sign out of Google Talk—for example, if you want to switch the focus of all
chats and invitations to Google Talk on a computer. Signing out can also extend your
battery life.
S On your Friends list, press Menu
You no longer receive chat notifications or see others' Google Talk status in other
applications, such as Gmail.
NOUG-2.1-update1-105
and touch Friends list.
and touch More > Sign out.
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Nexus One User's Guide