Means for allowing triggering of all registered handlers

Hi,

Could a means be added to Web Intents to allow ALL matching registered 
handlers to be executed (with an event to indicate completion)?

I would think one should be able to use such a means to make one's 
application extensible via "plug-ins" whose code could add overlays or 
behaviors (e.g., to allow 3rd parties to add their own context menus to 
one's web app), of course bearing in mind security concerns (as with 
single service usage), or the approach could be used for 
publish-subscribe, etc.

For example, one might have a third party client app to request Twitter, 
Facebook, Google Mail, etc. (e.g., if the user had set such a preference 
to allow this behavior at these sites), to pass on messages which could 
be shown and handled in a common interface (like POP or IMAP email).

The "persistent connections" approach 
(http://dvcs.w3.org/hg/web-intents/raw-file/tip/spec/Overview.html#persistent-connections 
) could also enable development of a multi-service chatting application 
with discovery of new services.

Thanks,
Brett