From the NannyMUD documentation

LAST CHANGE

 2000-12-11 

TOPIC

 
NAME
          key - how to make a key


DESCRIPTION
  	With the lock system in /std/basic_lock it is very simple to
	make a key that fits a /std/door or a /std/box. A key is a 
	/std/basic_thing with the alias "key" and the property "code"
	set to a string that acts as the "password" to the door.
  

 
EXAMPLE
	Here is an example of a key:

	inherit "/std/basic_thing";
	 
	reset(arg)
	{
	  ::reset(arg); // Make things work right.

	  if (arg) return;
	  set_name("bronze key");
	  add_alias("key");
	  set_short("A bronze key");
	  add_property("code","hemligt");
	}

	or as a function:
	make_key() {
	  object key;
	  key = clone_object("/std/basic_thing");
	  key -> set_name("iron key");
	  key -> add_alias("key");
	  key -> set_short("An iron key");
	  key -> set_long("The key is a bit rusty.");
	  key -> add_property("code","xyzzy");
	  return key;
	}

	It is also possible to make a key using /std/lib.
	"/std/lib"->make("key",([ "type" : "steel","code" : "foobar" ]));