The rlogin command gives the user the ability to log in to other unix machines on the network. In order to be able to login to another system the user needs to execute the following command:

$ rlogin machinename
machinename is the name of the previous machine. On doing so the user may be required to enter the password for the remote machine.

For ex. The code snippet of logging in to a machine:
venus$ rlogin starbug -l user2
Password:
Last login: Wed Nov 1 13:08:36 from venus
Sun Microsystems Inc. SunOS 5.9 Generic February 2002
venus$ pwd
/home/user2
venus$ logout
Connection closed.
venus$   _{Your Comment}