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ramanprakashramanprakash 

simple authentication

I need to have a link to from inside 'Sales Force Portal' to a different server. In that link (which is on a different server), I need to verify that the link is valid.

 

I have the user's session with me. 

 

Is there anyway I can check is the session is valid using simple PHP and hopefully without any APIs (as I have php 4.x) ?