Usually, AirDDO works with a distant database. However, if a problem occurs, it is possible to switch to another database (distant or local) by clicking on the following icon : 
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Indeed, this button gives an access to a different database. The button is called after the database name.
(NB : Following the configuration, the switch can be done automatically).
If the switch is done when a playlist in on air, a message is displayed to inform you not to modify the current playlist.