The help provided with Navision/NAV has always been called online help to the dismay of some people as it really wasn't on-line. Since almost a year, however, this 'online' help has been put on-line. And as I experienced, on some Dynamics User Group posts I took part on, that various developers and users did not know that, or thought this was only for msdn members: there for this small post on Microsoft Dynamics NAV 2009 Developer and IT Pro Documentation that is really on-line now!
Gratefully I have been using it already for my own reference and as links pasted into my posts. The only disadvantage to the help provided with the application is the searching and browsing: it's not as good on-line.