Yesterday I did some research to figure out, how to use the Yahoo! Messenger API. As result I have to announce, that this API is unfortunately only for Plug-In Development.
"The Messenger Plug-in SDK is a JavaScript and C++ API that you use to create add-ons with collaborative features that can run inside Yahoo! Messenger. Plug-ins run in the main Messenger window, or as part of an IM conversation.""Create plug-ins that are as simple as an HTML web page, or as sophisticated as a map collaboration tool that uses ActiveX, Flash, DHTML, AJAX or any other browser-based technology."
For more details see here.
This afternoon, we are going to meet and discuss, how we will proceed and what are the next steps.
-Joern