Google Nexus One User Manual page 116

Accounts
The screen displays your current sync settings and a list of your current accounts.
indicates that some or all of an account's information is configured to sync
automatically with your phone.
indicates that none of an account's information is configured to sync
automatically with your phone.
Check or uncheck Background data to control whether applications and
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services can transmit data when you are not working with them directly (that is,
when they are running in the background).
If you uncheck this option, Gmail stops receiving new mail, Calendar stops syncing
events, and so on, until you touch the Refresh menu item or send an email.
Check or uncheck Auto-sync to control whether changes you make to
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information on the phone or on the web are automatically synced with each other.
For example, when this option is checked, changes that you make in Contacts on
the phone are automatically made in Google Contacts on the web.
If you uncheck this option, you may be able to use an application's tools to sync
data manually. See "To sync information manually" on page 117.
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Touch the account to configure.
Some or all information from this
account is configured to sync
automatically with your phone.
No information from this account
syncs automatically with your phone.
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Nexus One User's Guide