From the NannyMUD documentation

LAST CHANGE

2000-12-12

FUNCTION

NAME
        exec - Connect a socket to a new object.


SYNTAX
        int exec(object new, object old)

DESCRIPTION
        This function is used to shift an interactive user betwen two
        objects. The function `valid_exec()' is called in `/secure/master.c'
        with the calling object as argument. If `valid_exec()' accepts
        the calling object the interactive user is switched from the object
        `old' to `new'.


NOTE
        It is very easy to become confused when writing the code that uses
        this efun. All the internal variables like `this_player()' or
        `this_object()' remain unchanged, it is just the user that is 
        switched between the objects.


NOTE
        This is one of the greater threats to security in the system. Unless
        the use of this efun is rigorously restricted anyone can become arch
        or keeper.


NOTE
        Don't do this unless you are VERY certain what you are doing.