restrict two users to login

Hi There,
I am developing a online application with JSP and SqlServer.
I want to restrict a particular for two times to login from different m/cs .
Can anybody suggest some tips or possible with some code.
Thanks in advance.
m_sharma98Asked:
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TimYatesCommented:
Store an arraylist of logged in users and their sessions (in the session context)
remove the users from the list when they log out, or their session expires (session listener)
when they log in, check if there are two people already, deny access, else add them in :-)

Tim
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vk33Commented:
but remember, that if you carelessly drop the cookies you won't be able to login before session expires... :)
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jimmackCommented:
I'm asking ;-)...

>>  Store an arraylist of logged in users and their sessions (in the session context)

session context?  Shouldn't this be at the application level?  Each session will have it's own context that can't see the others, won't it?
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m_sharma98Author Commented:
can you give mw some code snippets ?
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TimYatesCommented:
Sorry I meant ServletContext

SessionContext is EJB based ;-)

> Each session will have it's own context that can't see the others, won't it?

No :-)  Each Servlet can't see the others, but they all (usually) come from the same context, so data put into the context by one servlet can be retrieved from it by another...

Assuming of course that you knew I meant ServletContext ;-)

Hee hee
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rrzCommented:
Which version of Servlet API are you using?  

I think your situation is similar to this  
http://www.experts-exchange.com/Web/Web_Languages/JSP/Q_20514811.html 

But instead of ip address, you are interested in a count (Integer).
Be sure to implement kenneth's last suggestions.  
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