To select and open a form you must first choose a client and then a location. 
Selecting a Client
Choose File - Client from the main menu to bring up the Client List window for making your selection.
Selecting a Location
A location can be selected in two ways;
Either Choose File - Location from the main menu or Click on the Locations button on the Client List window to bring up the Location List window.
Selecting a Form
Once the location is selected or highlighted clicking on the 571 button will open the associated form.