Google Android 2.3 User Manual page 206

Google Talk
Set whether you sign into Google Talk automatically
1 In the Friends list, press Menu
Check or uncheck Automatically sign-in.
2
When Automatically sign-in is checked, you are signed into Google Talk when
you turn on your phone.
Signing in and out of Google Talk is described in "Signing in and opening your
Friends list" on page 196.
AUG-2.3-103
and then touch Settings.
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Android User's Guide