Solaris Users

I want to allow a certain user to enter the system uniquly not conccurrent. I mean if there is a user called "UUUU" for example and a password called "PPPP" if "UUUU" now is logging on so if he tried from another workstation to log I don't authenticate him unless he close the other session.
WaelEgAsked:
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plebrasCommented:
Test the uniquiness of the user in /etc/profile (file executed immediately after login)
by issued a command who or rwho with a grep and test if you have one or 2 lines with the $LOGNAME of the user . If so exit and the user will return to the prompt login.
Bye
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WaelEgAuthor Commented:
plebras Thanks very much for your answer but might I didn't describe the problem well.
The solaris system is only a security server. So the logged user not assummed to log totally on the system. if I write who the users don't appear I mean the authenticated users.
Explain more.
There is a device the ask a user for his user name and password. then it asks the Solaris system if the user is valid user. If he/she is a valid user it logged into the device. That is the story.
but I want the system to inhibit the user from logging again as it is now log.
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