NAME
	exec - connect a socket to a new object

SYNOPSIS
	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'.

NOTA BENE
	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.

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

FRIENDLY ADVICE
	Don't do this unless you're damn certain you what you are doing.