NOTE

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NOTE: UNIX actually distinguishes between a communications session and a login session, in that it is possible to log in as one user, log out, and log in again as another user without disrupting the communications session. Because an increasing number of people access UNIX systems from a PC, and for purposes of simplicity in this tutorial, we've treated the communications and login sessions as identical in this chapter. As you become more familiar with the UNIX environment and with utilities such as telnet, this distinction will become more important.