While using Apps on Demand, you'll see the Workspaces Applications Navigation Bar between your browser header and your applications.

Catalog - You can have multiple applications running at the same time. Select an application from the list displayed here. Your current application(s) will remain open.

Windows - If you have more than one application running, click this icon to display each of their windows. Click a window to bring that application to the front.

My Files - Access your OneDrive and Temporary Files. Be sure to store your work on your OneDrive. (Work stored in Temporary Files will disappear when you end your session.)

Clipboard - Only when not using Chrome. With other browsers, this is how you copy from an application in Workspaces Applications to your local clipboard for pasting into a local application, or from local to remote. Chrome does this automatically. 

Microphone - Enable/Disable access to your local microphone

Camera - Enable/Disable access to your local camera

Preferences - various display, input and other options. most people never alter these settings

Full Screen - Click to enter Fullscreen, ESC to exit.

Dual Monitor - Opens an additional browser/client window as an extended desktop.  You can move applications between these windows.

Full Screen - Toggle full-screen mode

Profile - Use to end your session, download the standalone (non-browser) client, send feedback and access additional information