def nextCommand( self ):
    """Get/set the Next Command offset value (ULONG).

    Errors:
      AssertionError  - Thrown if the assigned value (after conversion
                        to a <long>) is either negative, or greater
                        than (2^32)-1.
      [ TypeError,    - Either of these may be thrown if the assigned
        ValueError ]    value cannot be converted into a <long>.
    """
    return( self._nextCommand )