Ironically the demos are downloadable samples that focus on showing of ajaxian database applications.

The demos available are:

• Vacation Tracker: Losing track of time? This rich application manages your time off. See how little source code is necessary to build a powerful live web application.
• 4D Jukebox: See how you can get a full-featured media player app from 4D on to the web with this implementation of the 4D Ajax Framework. Less than ten lines of code drive this dynamic web application.
• Tech Support: A windows MDI application developed using the 4D Ajax Framework Client. This demo was built to show the power of the 4D Ajax Framework Client Development Environment. No custom code was necessary for the web portion of this demo.

source: ajaxian