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At this point I don't want to interface w/ google account, I just would like to know if they are logged in to a google account or not, and then serve slightly different links if they are|aren't. I'm using PHP and strict (where possible) HTML 4.

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If you're not using Google as an OpenID provider I don't think there is any way to know. That kind of information is kept off limits as a security precaution.

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There was a method discussed in the answer on this SO post, however, it's doubtful that the method will work reliably for organizations which have an interest in maintaining users' privacy: stackoverflow.com/questions/5233560/… –  danlefree Mar 30 '11 at 14:03
    
One day the Internet will be secure. I just hope it's in my lifetime. –  John Conde Mar 30 '11 at 14:17

I hope this is not possible. What you are trying to do is to access the type of information others would not want to share with you. I know this does not address your question directly but maybe there is another way to achieve what you want to achieve?

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