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Microsoft.Live.Messenger.Presence Namespace

Cc298781.pubclass(en-us,MSDN.10).gifPresenceExtension Base class for presence extensions. Presence extensions provide a means to set custom presence properties for users of your Web-based applications. Derived classes are required to support the get_name function. This class can be extended with other data and methods depending on your requirements.
Cc298781.pubclass(en-us,MSDN.10).gifPresenceExtensionCollection Represents a collection of presence extensions.
Cc298781.pubclass(en-us,MSDN.10).gifPresenceExtensionFactory A factory class that must be derived from to add custom presence properties.
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