Hi Experts.
I'm a newbie in Web development , Could you please help me.
In my Website upon a user Logs in , i save the UserID and his Password in SESSION variables and i use them wherever i need them.
But How Can i prevent a user from logging twice at the same time from different machines?. (some think like Yahoo messenger)
By the way as far as i know , the web and web-pages are STATE-LESS, so there is not a live connection between users and web-servers, however is there any way to understand how many users currently aresurfing my web-site?
Thanks in advance.
Kind Regards.
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