2.2.  Verbs

     Verbs are the means whereby a  player  manipulates	 the
environment.   Verbs can denote	motion,	investigation, mani-
pulation, and any other	action the ADL programmer  can	ima-
gine.	A Verb is represented by a sixteen-bit integer known
as the Verb ID.	 Like Objects, Verbs are record	 structures.
They have the following	elements:

PREACT	      The ID of	a routine to  be  called  when	this
	      Verb  is	typed by the player.  The routine is
	      called  before  the  ACTION  routines  of	 the
	      Objects  in  the	sentence.  See Chapter 4 for
	      more information.

ACTION	      The ID of	a routine to  be  called  when	this
	      Verb  is typed by	the player.  This routine is
	      called  after  the  ACTION  routines  of	 the
	      Objects in the sentence.	Again, see Chapter 4
	      for more information.

     Verbs may also be used as modifiers to nouns.  This  is
to  allow  easy	 implementation	 of  Objects like the "north
wall" or "go north" (where "north" is  normally	 a  verb  of
motion).

     ADL predeclares the two  Verbs  "TELLER"  and  "NOVERB"
which  are  returned by	the parser under circumstances shown
in Chapter 9.  Although	TELLER and NOVERB  are	predeclared,
their properties must be defined by the	ADL programmer.