Asynchronous Client-Server Interaction:
Hidden frame, using top/parent frame's variables to retain scope == HMLHTTPRequest (so long as the returned HTML is not significantly larger than the returned XML would be)
So long as the majority of server requests is nearly instantaneous, where "waiting for the user to pick something" is orders of magnitude more time consuming than processing the decision (which seemed to be true in 99.99% of all cases)...
The client was notified by the hidden frame calling (onload) a function in the parent/top frame. No big deal. In fact, is not this more efficient than weighing down the client script with the duty of monitoring/listening ....?
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