Many (awesome) changes http://blog.jquery.com/2010/01/14/jquery-14-released/.
View the release notes here: http://jquery14.com/day-01/jquery-14

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Background
“Long polling” is the name used to describe a technique which:

An AJAX request is made (utilizing a javascript framework such as jQuery)
The server waits for the data requested to be available, loops, and sleeps (your server-side PHP script)
This loop repeats after data is returned to the client and processed (usually in your AJAX request’s onComplete [...]

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I’ve been developing a stock market screener with some advanced functionality.  Some of the parameters a user might enter, because of their complexity or sheer volume of data required to calculate, would cause the screener to run for considerable amounts of time before returning results.  The opportunity to create a progress bar presented itself.  EVERY [...]

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