I’m working on an AJAX heavy site for a defined audience who all have JavaScript - so I have a form with no submit button that gets submitted by an change handler.

I’ve recently been working with AJAX and SOAP which both result in multiple sessions running concurrently.

For example if you have an AJAX progress bar for a large file upload one session is uploading the file while a series of shorter sessions check on progress and update the bar.

How to track both parts of this cleanly has had me scratching my head a bit - but the solution is fiendishly simple.