Fill in the minimum requirements

In addition to implementing the callback methods that your extension declares, there are only two operational requirements.

1. IChatExtensionCallback_Name must return a unique short name.
2. IChatExtensionCallback_Init should return 0.

Extensions that do not implement these requirements will fail to install when added to the chat service.

Tip: Save a global reference to the IChatRegistrar object passed to you in IChatExtensionCallback_Init. You will need this object to perform callback bindings. This is the only object reference that you should maintain beyond the scope of an event notification.

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