Manage the startup applications
After the login in GNOME 3 a lot of applications will be automatically started in order to execute many invisible tasks like to notify you of incoming alarms in the calendar or to unlock your keyring containing your saved and encrypted passwords.
There’s a tool in GNOME 3 which allows to add, modify and remove the autostart entries and you can run it by executing from a terminal or from the ALT+F2 dialog the command: