OUOFSU ( offset, under, dist, sense, ifail )
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  Output offset surface

Receives:
  KI_tag_surface           *offset         --- offset surface

Returns:
  KI_tag_surface           *under          --- underlying surface
  KI_dbl                   *dist           --- offset distance
  KI_cod_logical           *sense          --- surface sense
  KI_cod_error             *ifail          --- failure code

Specific errors:
  KI_unsuitable_entity      Entity is not an offset surface

Description:
  The details of an offset surface (type TYSUOF) are returned.