HTML5 deployment: progress comes into sight

[Sannyasin Brahmanathaswami]

Mark Wieder wrote:

    Requests are sent asynchronously and trigger a callback message when 
    they're done. The callback message payload contains a reference to the 
    message that called it. That way a callback handler can associate the 
    returned message with the calling handler, and if needed a wait loop can 
    implement a procedural pseudo-synchronous call.

Fascinating solution for X no of use cases, where you don't really need *now* , but where what you really only need is to know "exactly when and what" happened, even if slightly (typically, milliseconds) after the whole series events/statements finish 

BR