Demo not working within my framework...

[athanasius]

If I understand well, you reach both the "http://www.foobar.com/appdir/chat/index.html" URL and the "http://www.foobar.com/lightstreamer/demos/ChatDemo/index.html" URL from the same apache running instance.

Correct.

Hence, when you ask the http://www.foobar.com/appdir/chat/index.html page, it correctly finds the /lightstreamer/demos/ChatDemo/ls/lscommons.js resource.

Correct.

There is no reason why it shouldn't find /lightstreamer/demos/ChatDemo/ls/lsengine.html resource.
Can you reach the page directly, either from the browser address bar or after putting a test "A" link on the chat demo page?

Yes I can access this file directly.

Can you find any refused request in your monitor or in your web server log?

None. The output of my proxy log (running on my desktop) shows that it never performs an http get request on the lsengine.html file. It gets as far as requesting lscommons.js, lspushpage.js & logo.gif then stops.

How does lsengine.html typically get called? (i.e. where and what path is prepended / appended).

Thanks.