Typical applications require the following action and data type definitions:
An action that opens the application.
A data type for the data files of your application. If you create a data type, you will also want to create:
An Open action for the data files of your application
A Print action for the data files of your application
A data type for the application group (see Configuring the Application Group To Use a Unique Icon).
For an introduction to how actions and data types are used in the desktop, see Chapter 10, Introduction to Actions and Data Types .