From the NannyMUD documentation

LAST CHANGE

2002-06-29

COMMAND

NAME
        setenv - modify/view environment variables


SYNTAX
        setenv [var value]

DESCRIPTION
        With no arguments, setenv prints out all of the current environment
        variables and their values. setenv with one argument sets a variable
        (the argument) to a null value -- which means that it could as
        well be removed, so it is. setenv with both arguments, sets the
        variable (first arg) to the value of the second argument.

        + WROOM         Specify the path to your workroom. Used by the command
                        'home'.
        + START         Specify the path to where you log on.
        + STOP          Specify the path to where you will be transfered when
                        logging out, before dropping things.
        + HOME          Specify where your default directory is.
        + GUILD         Used by guilds to mark a player as theirs.
        + BOARD_READER  Path to your prefered boardreader.
	+ WIZTOOL	The path to a preferred wiztool. If you don't want
			to get the wizmod, set this to /obj/wiztool .

        The moving messages that are displayed when you do various
	things. Each has a few requirements in addition to the
	message. The message must contain $N, which will be replaced
	with your name. In addition, MCLONE and MDEST require $O,
	which will be replaced with the name of the object you are
	cloning / destructing. Also, MOUT requires $D, which will be
	replaced with the direction which you are leaving in.

        + MDEST   Specifies the message written when you destruct something.
        + MCLONE  Specifies the message written when you clone something.

        + TITLE   The title/name you have on 'who' and  in  a  room. If
                  the title does not contain your name or $N, which  will
                  be replaced with your name, then your name will be added
                  first in the title.


SEE ALSO
        unsetenv in wizcommands/misc/unsetenv