def treeId( self ):
    """Get/set the Tree Connect ID (ULONG).

    Errors:
      AssertionError  - Thrown if the assigned value (after conversion
                        to a <long>) is either negative or greater
                        than 0xFFFFFFFF.
      [ TypeError,    - Either of these may be thrown if the assigned
        ValueError ]    value cannot be converted into a <long>.
    """
    return( self._treeId )