Application

The application object and top-level windows. App is the root of a simple app; AppShell adds a command bar, navigation pane, and paged content. Window opens a secondary top-level window.

App	The application window.

AppShell

Application window with rail + swappable sidebar navigation and content.

Window

A secondary top-level window.

The AppShell reference also documents its returned handles (Workspace, Page, Rail) in a Supporting classes section.