Single login to all workstations in network

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Hello All,     I would like to know if it is possible to have a common set of usernames and password  that the users can use in any linux system. Like in windows domain architecture when a username is created in the PDC the username is valid in all the clients in the network Is there a linux equvalent for this method ? with out creating the users seperately in all the systems ?  I am having this doubt because we are migrating from windows NT based network to Linux. Can anyone please help me ?     thanks in advance   regards   senthil