How to embed Horde applications into your website
I have written a small howto in the Horde Wiki that explains how to embed Horde applications into your own website or web application.
"Using Horde from a custom website or application" explains how to call API methods in Horde or one of the Horde applications from a PHP script that is not part of Horde itself. The howto contains several code examples and also shows how to embed complete HTML snippets into larger web site pages.
Example usage could be to embed the personal calendar from Kronolith into a third-party or custom coded portal or intranet software. Or one could add comments provided by Agora to an existing shop or directory solution, similar to what I've done on my homepage.
The code examples are pure PHP solutions, though one could interface with Horde through SOAP, XMLRPC, and REST too, using exactly the same API methods. But that might be stuff for another howto.