The point I was responding to was your assertion that this was already true of most enterprise and consumer webapps:

> > all enterprise application UI are actually web UI > Yes, and so are most consumer apps, and "moving state" to another device is simply a question of IM'ing a link.

That's a great aspirational goal but it's simply not something which most people can assume will work – I still routinely find apps from major companies where you can't even use the back button within the same session!