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+SYNOPSIS
+	mixed prepare_destruct(object obj)
+
+DESCRIPTION
+	Prepare the destruction of the object obj. Return 0 if the
+	object is ready for destruction, any other value will abort
+	the attempt. If a string is returned, an error with the string
+	as message will be issued.
+
+	The interpreter calls this function whenever an object shall
+	be destructed. It expects, that this function cleans the
+	inventory of the object, or the destruct will fail.
+	Furthermore, the function could notify the former inventory
+	objects that their holder is under destruction (useful to move
+	users out of rooms which re updated); and it could announce
+	systemwide the destruction(quitting) of users.
+
+	Strange things will happen if the mastor object does not
+	provide this function.
+
+SEE ALSO
+	remove_player(M), destruct(E)