Form definitions This section describes how to define application forms and program resources related to the presentation layer. Windows and forms The section describes the concept of windows and forms in the language. Using images Describes how to use pictures in the forms of your application. Accessibility guidelines This section describes the best practices to make your application accessible to disabled people. Message files Message files centralize strings and larger texts identified by a number, that can be used in programs. Action defaults files Action defaults files allow to centralize action configuration parameters such as text, icon, accelerators and behavior options in XML format. Presentation styles Use presentation styles to specify decoration attributes for window and form elements. Form specification files Form specification files are the source files defining the layout and content of application forms. Form rendering The section explains the layout rules to render forms on graphical front-ends. Toolbars Toolbars define a bar of buttons that appears at the top of application forms. Topmenus Topmenus define typical pull-down menus that appear at the top of application forms.