Free Hero Mesh

<dir>
  Move in the specified direction. (This does not move any objects; it
  only moves the cursor for pattern matching.) The direction can be
  relative to the current direction (initially the Dir variable of the
  origin object) or absolute.

<function>
  Call a user-defined function, which should be ( obj dir -- result ),
  and Self is the position from which the current matching started.
  The obj is the currently matched object (which may be zero), and the
  dir is the current direction. If the result is a number, then it sets
  the direction; if a object, sets the current object and the current
  location at that object's location; if a mark, the match fails.

<message>
  Send the message to all objects at the current location. From is the
  position from which pattern matching started. Arg1 is the direction.
  Arg2 is the currently matched object (which may be zero). If the
  return value is zero, it continues normally; if one, the match fails;
  if two, it continues without sending more messages at this location;
  if an object, sets the matched object and current location.