To set which applications you would like to startup automatically at login, go to System Preferences and then click Accounts under the System header. Click the Login Items button. Next, click on the plus or minus buttons in the bottom left corner of the window to add or remove applications from your list. The next time you login to your Mac, the selected applications will launch automatically.
Related: Investigate Login Items, Can’t login to one user account., Why do I have a certificate on my login keychain, Is iTunes Helper in login needed, Login Items Preferences won’t stick.
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