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As we have re-merged this fork module with its original role model there will be no more development this module here. We recommend that you replace js_callback with js in order to receive further update information. The js module now provides every feature which was added in this fork module.
Thanks for your support and understanding!
Overview
This project targets module developers and provides a "bare bone" callback handler which is intended to be addressed by modules wanting to improve response times for specialized tasks.
The idea of such a callback handler was first introduced by http://drupal.org/project/js (which we hence sometimes refer to as the "original module"). The D6 branch of js_callback was a clone of it and originally intended as a workaround to fix some issues which had been addressed there for a while. In the long run, we still intend re-merging both projects to avoid confusion.