Getting Started with AJAX API
From LongJump Support Wiki
DEPRECATED: The AJAX APIs are deprecated. They continue to work, for backward compatibility, but they are not being extended or enhanced. (Web pages should use AJAX and REST to carry on a conversation with the server, rather than the deprecated AJAX APIs.)
For information on this deprecated functionality, see the version 8.0 platform docs:
https://agileappscloud.info/lj80/index.php?title=Getting_Started_with_AJAX_API