Dialogs are used to display additional details which allow you to create/maintain such things as “Supplier”, “Producer”, “Country” information. You can access them through the appropriate menu option and/or from the tool bar. In some cases there are also buttons which provide access to these dialogs, for example on the drink details tab.
Most of them should be very intuitive to use and will not be documented in this help file, the following ones are a bit more complex and/or are good examples to understand other dialogs.