> My take is that the major item not readily available is a notification
> mechanism, to be triggered when something changes, with users
> registering themselves with some kind of call-back function.
> 
> I dunno what's avaiable in desktop software libraries for this, but I
> see html5 providing such a mechanism in its 'local storage' feature.
> Like see http://www.quirksmode.org/blog/archives/2009/06/html5_storage_t.html
> and  http://html5demos.com/storage-events.

Yes. LocalStorage is handy and easy to work with -but- though it's available 
storage on user's pc's, it's only makes sense in the scoop of a visited page. 
(does that make sense?).. I'll elaborate: Unless you are managing a html-page 
that a user ownloads, you cannot access the localStorage of that pc [in my 
understanding]. The access happens through scripts on the page.About events .. 
administering the erection of a html-page with it's scripts, on a server, does 
not really provide server-side events - except for the return response of a 
xmlhttprequest or similar, send from the client. But, this could be enough. 
(look up AJAX for the xmlhttprequest ) The ping-ing back and forth takes simple 
code .. it won't be  cluttered up until you want to use it for something 
sensible ;o)
> BTW, I believe the OP is looking for handling not a random file
> (hardly that!) but an 'arbitrary' user-selected one.


                                          
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