10.1.  Object properties

     The  following  object  properties	  are	defined	  in
     standard.adl.  The	ADL programmer using standard.adl is
     advised not to re-use these properties  with  different
     meanings, as strange and unusual things will happen.

		  SEEN	  = 16;
		  OPENS	  = 15;
		  LOCKS	  = 14;
		  OPENED  = 13;
		  LOCKED  = 12;
		  TRANS	  = 11;
		  LIGHT	  = 10;
		  FLAME	  = 9;
		  NOTAKE  = 8;
		  AllLink = 29;
		  SAVESENT = 28;

     This leaves boolean properties 1 though 7	and  integer
     properties	 17  through  28  free	for the	programmer's
     definition	and use.  The above properties are  used  as
     follows:

     SEEN	   The standard	 looking  daemon  sets	this
		   property  of	 a room	to TRUE	whenever the
		   player visits the room.

     OPENS	   This	property should	be set to TRUE if it
		   is  possible	 to open or close the object
		   (a treasure chest would be an example  of
		   this).

     LOCKS	   This	property should	be set to TRUE if it
		   is  possible	to lock	or unlock the object
		   (a door might be a good example of this).

     OPENED	   This	property  is  set  to  TRUE  if	 the
		   object is already opened and	FALSE if the
		   object is  closed.	This  is  meaningful
		   only	if OPENS is TRUE.

     LOCKED	   This	property  is  set  to  TRUE  if	 the
		   object  is locked and FALSE if the object
		   is unlocked.	 This is meaningful only  if
		   LOCKS is TRUE.

     TRANS	   This	property should	be set	to  TRUE  if
		   the object is transparent (a	glass box or
		   a bottle  would  be	a  good	 example  of
		   this).

     LIGHT	   This	property should	be set	to  TRUE  if
		   the	object	gives off light	(in the	case
		   of a	transportable object like  a  flash-
		   light)  or if the object is intrinsically
		   lit (like an	outdoor	location).

     FLAME	   This	property should	be set	to  TRUE  if
		   the object is on fire.

     NOTAKE	   This	property should	be set to TRUE if it
		   is  desired that "take" and "drop" ignore
		   the object when "take all" or "drop	all"
		   are requested.

     AllLink	   This	property is used by the	 PREACT	 and
		   ACTION  routines  of	the verbs "take" and
		   "drop" and should not be used by anything
		   else.

     SAVESENT	   This	property is used to hold the  start-
		   ing number of a block of six	global vari-
		   ables in which to store  a  sentence	 for
		   use with ActAction, below.