Session, Cookie sharing (Single App, multiple domain)

Webtologist
Webtologist used Ask the Experts™
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Here's the situation.  I have a single website but binded with multiple domains.  One domain is the general domain (www.company.com), the second domain is something like (site123.mysites.com).  The 2nd domain is used for HTTPS, so users may redirect back and forth between the domains based on whether SSL is required.  So to clarify this is a single website, not two, but binded to multiple domains.  So the problem arises with cookies because sessions are based on cookies.  So how can I make a single cookie be accessable between the 2 domains within a single web application?
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