From the NannyMUD documentation

LAST CHANGE

2000-12-08

COMMAND

NAME
        VIS - Toggle hard invisibility.


LOCATION
	Wizmod, module 'default'.

SYNTAX
	VIS

DESCRIPTION
	This toggles your hard invisibility. It can only be used by the admin.


SEE ALSO
        invis in lfun/living/living_functions


SEE ALSO
        vis in lfun/living/living_functions