MSN Activity API
On 9/12/2005 Microsoft will officially release the MSN Activity API at PDC during this session: COM301 - MSN Messenger: Extending MSN Messenger with Multi-Person Instant Messaging Applications.
This is not the SDK for MSN Messenger Server or for the MSN Messenger application itself. Here is an overview of the MSN Activity API as described in the SDK's help file:
MSN® Messenger Activity API allows developers to build applications that take advantage of the multiuser communication functionality provided by MSN Messenger. Developers can design applications using this simplified connection model.
The application in the Activity window is a Web page that interacts with MSN Messenger through the application programming interface that is defined in this software development kit. Your Web page can provide any functionality that can be present in a normal Web page.
You start an Activity from either the Games or Activities button that appears on the toolbar of the Conversation window in MSN Messenger version 7.0 (and later).
Download the SDK from http://msdn.microsoft.com/msn/messenger (direct link here).
If you have any coding questions or general info about the new API go to the Official Messenger APIs General Forum.
Along with the release of the SDK Microsoft also announces a contest for activities developers. There will be prizes :). Get all the details here: http://activity.msn.com.