Problem about YMSG v19 login process...

Hi all,

I'm developing Yahoo IM Messenger Login function.
Now I reference YMSG v16 ( http://carbonize.co.uk/ymsg16.html ) for login process design.
But the last YMSG version is v19.

Is there any difference between v16 and v19?
Does Yahoo Authentication Server have backward capability for YMSG v16?

Thanks in advance!

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