What the term "Downgrade path" mean in UIQ3.

If a application is not coded to work on all available "UI Configurations" the UIQ3 UI framework will try to look for a nearest match and configures the Screen to that configuration, this process is called "Downgrade path".

"Downgrade path" also makes it possible for an application to run on a device which has a UI configuration that was not available at the time the application was written.