scm_cookie

hi, would anyone be so kind to explain me what scm_cookie function &
stuff is about? I've searched google but can't find anything except
questions about this. 

TIA

P.S.= if more of this email arrive on the ml it's because i've sent 2 to
different addresses, and i suspect both to be linked to the same ml.
-- 
    Claudio "thefly" Martella
    thefly@xxxxxxxxx
    claudio.martella@xxxxxxxxx
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