A handful of people have asked if and when the DExt demo will be made available as a download. The respective answers are yes and now.
What I am about to make available was only ever meant as a work in progress. Take from it what you will though. If nothing else take a look at the NotesSession Form in there, which will soon become known as Ext.nd.Session.
Note: Only works with Domino 7.0.2 and only with the version of Ext included in the NSF. I've not tested it with the 1.0 release, so don't know if it will work as is.