API for showing modal dialogs
API for interacting with the document editors, such as adding context menus to document editors
API for working with document editors
API for working with the Extensions menu
API for showing message boxes
API for sending and receiving messages between entry points in the same extension
API for working with notification popups
API for working with dockable panes
API for working with the user preferences
API for working with (document) tabs
API for working with document editors
API for interacting with the app explorer, such as adding context menus to documents