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Windows Messenger Overviews

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[Windows Messenger is no longer available for use as of Windows Vista. For more information, see Windows Messenger.]

Overviews
Coordinating Toast Pop-ups Between Multiple ClientsThis topic provides basic information about coordinating Toast Pop-ups between multiple clients.
Developing and Testing Applications with the Messenger Service APIsThis topic provides basic information and requirements you need to develop, test, and deploy Messenger client applications that use the Messenger service APIs.
Messenger Lock and Key APIThis topic explains how to unlock the Messenger service APIs using Messenger Lock and Key.
Messenger Session Invite and Messenger Private APIsThis topic provides information about the Messenger Session Invite APIs that provide a way to run peer-to-peer applications for any two Messenger client users.
Using the Registration MechanismThis topic provides basic information about registering a non-Microsoft messenger application.