Some handy tools/sources for learning about development with the NAV RTC:

Very comprehensive guide on how to create and maintain pages: http://msdn.microsoft.com/en-us/library/dd338806.aspx

Library of icons/images you can use for actions: http://msdn.microsoft.com/en-us/library/dd568728.aspx

Walkthrough for creating and using RTC Control Add-in: http://msdn.microsoft.com/en-us/library/dd983804.aspx