Broadcasting a discovery message tells Skype that an application wants to connnect. Is there any command available to tell Skype that an application wants to disconnnect from Skype, such as during an application shutdown? Or is Skype not receiving a PONG in response to a PING the only way?

I have the same question, anyone?

It looks like the suggested method is setting the window handle to null, see the
#disconnect command in this example, the readme.txt file and the source code.

https://developer.skype.com/Download/Sample...example_win.zip

Which came from:

https://developer.skype.com/Docs/Examples

With Skype4COM lib, simply set the using reference to null as well.