The Windows Live Messenger Web Toolkit enables developers to integrate and enrich their Web-based applications with Windows Live™ Messenger. With the Windows Live Messenger Web Toolkit, you will get instant access to:
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Real-time presence and communications
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Contact relationships
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Rich profile data
You can integrate with the Windows Live Messenger Web Toolkit in the following two ways:
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Windows Live Messenger UI Controls: The Windows Live Messenger UI Controls are a set of 16 HTML-based controls that encapsulate the most common scenarios for Web developers. You can use an easy XHTML markup scheme and CSS to customize the appearance and behavior of the controls on your Web site without having to write JavaScript code. The use of these UI Controls is recommended for most developers.
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Windows Live Messenger Library: The Messenger Library is a powerful client-side JavaScript library that exposes an object model for integrating with Windows Live Messenger. The use of the library is recommended for advanced developers who want to enable custom scenarios that the UI Controls do not support.

Windows Live Messenger Web Toolkit Usage Scenarios
You can easily enable the following usage scenarios by using the Windows Live Messenger Toolkit:
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Extend your site's functionality with real-time presence and instant messaging. Users of your site can send messages to one another.
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Enable users to update their Windows Live Messenger personal message to link to content on your site. This will be seen by the users' contacts and connections across Windows Live, both on the Web and in the Windows Live Messenger client.
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Use Windows Live Messenger profile data on your site. All Windows Live Messenger users have a friendly display name and profile picture that can be used to personalize and customize user profile data on your site.
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Allow users to sign in to your blog site and leave comments by using their Windows Live ID and Windows Live Messenger profile.
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Allow users to invite their contacts in Windows Live Messenger to chat and play a casual game together in real time.

Documentation Map