The DIRECTORY command allows you to obtain a list of those people with
whom you could talk on your system or any other system in a network.
If you enter the command without additional information, you get
a list of the people on your system.  If you enter the command with
a node name string, you get a list of the people on that system.
Thus, the complete syntax of the DIRECTORY command is:

        DIRECTORY [node[::]]

The following information is displayed about each person:

        o       Their process name and user name.
        o       Whether or not their terminal can be used as a telephone.
        o       Whether or not they are currently using PHONE.

The directory is displayed, line by line, on your terminal until the entire
list is displayed or until you type any key on the keyboard.
The parameter to this command may also be a logical name.