 from some
   external source, such as a file or through interactive user input.
<P>
 
<PRE>
   /*
      Request pointing from a C-kernel file for a sequence of
      pictures obtained from the Voyager 2 narrow angle camera.
      Use an array of character spacecraft clock counts as input.
 
      Decode the output clock counts and print the input and
      output clock strings. Also print the equivalent UTC time
      for each output clock time.
 
      Note that the SCLK kernel file must contain VGR 2 clo