This is part of the Administrator Tools.  It allows to make Audiqueen communicate with the FOX- application. Select the right database in the Database Connection Settings window.  See FOX User Manual for more details;

Fox related functionalities in Audiqueen are only available when CustomSound is installed.

The records of an Audiqueen patient can be linked with his/her records 
in the corresponding FOX- database. 

Use the FOX-button in the Patient Information window to link
the Audiqueen data of a patient with his/her data in FOX.