`wn`
The input stream word number, counting from 1.
+.. _library-routines:
+
Library routines
================
Returns the type of its `{arg}` : 3 for a string address, 2 for a routine
address, 1 for an object number, or 0 otherwise.
+.. _object-props:
+
Object properties
=================
For a `lockable` object: the `{obj_id}` (generally some kind of key)
needed to lock and unlock the object, or `nothing` if no key fits.
+.. _object-attrs:
+
Object attributes
=================
`worn`
For a `clothing` object: is being worn.
+.. _entry-points:
+
Optional entry points
=====================
`UnknownVerb()`
Called when an unusual verb is encountered.
+.. _group-1-actions:
+
Group 1 actions
===============
`XTree` "`TREE`"
=============== ===================================================
+.. _group-2-actions:
+
Group 2 actions
===============
`Wear` "`DON`", "`PUT ON`", "`WEAR`"
============= =============================================================
+.. _group-3-actions:
+
Group 3 actions
===============