log into many websites with one login

In php, when 3 separate domain names



each site when you log in it logs you into all three sites at once
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rgb192Asked:
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TvMptCommented:
if you want the easiest way you should use openid

http://openid.net/
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Ray PaseurCommented:
Where are the sites hosted?  Have you considered using the open graph (Facebook)?
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rgb192Author Commented:
Domains were not created yet, but when I do, I could use any of the 3 tools

thanks
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