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On a network with machines belonging to several different groups of people, care must be taken to:
You, as an individual user, can control who has access through the network to your account by using the Account Manager to add user equivalence. If the system administrators have not established system equivalence between two machines on which you have accounts, you can use this manager to create your own user equivalence between your accounts on the two machines. You can also create user equivalence to your account for any other user.
System or user equivalence applies only to the rlogin, rcp, and rsh commands. With rlogin, if no equivalence is established, it prompts for a user name and password; if equivalence exists, rlogin skips this step. You cannot use the rcp and rsh commands unless system or user equivalence exists.