Session, Cookie sharing (Single App, multiple domain)

Webtologist used Ask the Experts™
Here's the situation.  I have a single website but binded with multiple domains.  One domain is the general domain (, the second domain is something like (  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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