[TYPO3] Extension to addq comments to a TYPO3 page ?

[Alex]

Hello,

I'm looking for an extension to allow some authenticated users to add 
comments ( a la blog) in a page.

I don't want any fancy feature, BUT :
- the authentication should be done by an existing network windows domain 
controller
- the comments should be stored in a separate MSSQL DB with a data structure 
that I will define.

Do you think this exists ?

Actually, I think I could code the PHP to add/store/display comments, but 
I'd better not manage the authentication, and use something provided by 
TYPO3.


Thanks for any advice.
-- 
 Alex
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