rame `from' or `to' is not recognized the error
       'SPICE(UNKNOWNFRAME)' will be signaled.
</PRE>
<h4><a name="Files">Files</a></h4>
<PRE>
   Appropriate kernels must be loaded by the calling program before
   this routine is called.  Kernels that may be required include
   SPK files, PCK files, frame kernels, C-kernels, and SCLK kernels.

   Such kernel data are normally loaded once per program
   run, NOT every time this routine is called.
</PRE>
<h4><a name="Particulars">Particulars</a></h4>
<PRE>
  