WCAG 2.0 and Section 508 Accessibility Compliance
The interface of RadNotification for ASP.NET AJAX is level AA accessible (in compliance with the W3C Web Accessibility Guidelines 2.0) as well as Section 508 compliant. It passes the check of the WAVE automated content compliance tool for Section 508 and WCAG 2.0 - Compliance Level AA.
It also offers WAI-ARIA support.
If automated tools report issues with <iframe> elements without a title, they can be considered false positives. They are likely the overlay frames the controls use so they can be shown above heavyweight objects like PDFs or applets. You can disable those frames by setting the Overlay and NotificationMenu.EnableOverlay properties to false.