This 2 part video demonstration shows how you can use XPages components in the Lotus Notes 8.5.1 client. It also demonstrates many of the new features available in 8.5.1. Note that these videos include audio.
Part 1 of the video (displayed below) demonstrates how to create an XPages component, how to include it in a composite application, and how to use component parameters to customize it at run time. Part 2 demonstrates how you can integrate this component with other Notes client and web components to publish and receive events. Part 2 of this video demonstration can be seen here: XPages Components in the Notes 8.5.1 Client: Video Demonstration - Part 2
XPage Components in Notes 8.5.1 - Part 1