From the NannyMUD documentation

LAST CHANGE

2001-01-06

FUNCTION

NAME
        drop - prevent an object from being dropped


LOCATION
	Possible in any object that can be carried.

SYNTAX
int drop(int silent);

DESCRIPTION
	Whenever a player attempts to drop an object, the local function
	'drop' is called in that object.  A non-zero return means the
	object will not be dropped.  A non-zero argument should mean to not
	print any messages. 


RETURN VALUES
       A zero value or the absense of this function means the object can be
       dropped.
        A non-zero value means an object cannot be dropped.


NOTE
	It is senseless to define this in objects which cannot be taken.

	When a player quits, all non-droppable objects are destructed.

	Non-droppable objects should not have weights.

	You can print out messages saying 'The doll won't let you drop her'
	and such in the drop() function, but be sure to only print them
	out when no arguments are passed (to comply with the 'silent' 
	convention).

	Normal non-droppable objects include guild and club objects, 
	wizard tools, 'disease' objects, etc.  

	Do not refer to 'this_player()' within the drop function.  This
	can cause bugs when this_player() returns 0 or someone else.  You
	might instead use environment().


SEE ALSO
        query_auto_load in lfun/basic/query_auto_load


SEE ALSO
        get in lfun/basic/get