OUFGSU ( surf, arrlen, key, keylen, ivals, rvals, sense, tf, ifail )
====================================================================

  Outputs a Foreign Geometry (FG) surface.

Receives:
  KI_tag_surface           *surf           --- Foreign surface.
  KI_int_nchars            *arrlen         --- Length of input key array.

Returns:
  KI_chr_key                key[arrlen]    --- Surface key.
                                           --- (truncated if necessary)
  KI_int_nchars            *keylen         --- True length of surface key.
 <KI_tag_list_int>         *ivals          --- List of integer values.
 <KI_tag_list_dbl>         *rvals          --- List of real values.
  KI_cod_logical           *sense          --- Surface sense.
 <KI_tag_transform>        *tf             --- Surface transformation.
  KI_cod_error             *ifail          --- failure indicator

Specific errors:
  KI_unsuitable_entity      Not a foreign geometry surface.

Description:
  This function, given a tag, outputs the data of a foreign surface.

     'surf'    The tag of a valid foreign surface.

     'arrlen'  The length of the key array being passed to this KI function.

     'key'     The array of characters into which the key of the surface is
               copied. (If the array is not long enough to store the key, then
               the key is truncated.)

     'keylen'  The true length of the surface key.

     'ivals'   Integer values supplied to the surface evaluator.

     'rvals'   Real values supplied to the surface evaluator.

     'sense'   The surface sense.

     'tf'      The tag of the surface transformation.


  In cases where the foreign surface was created without a transform and only
  identity tranforms have been subsequently applied to it, the returned
  transformation tag 'tf' will be the NULTAG ( APPTRA does not modify the
  transformation when identity tranformations are applied ).