A><TT>filled</TT>
  <DD>This value indicates that the node's interior should be filled.
The color used is the node's <TT>fillcolor</TT> or, if that's not defined, its
<TT>color</TT>. For unfilled nodes, the interior of the node is transparent to
whatever color is the current graph or cluster background color.
Note that <TT>point</TT> shapes are always filled.
<P>
Thus, the code
<XMP>
digraph G {
  rankdir=LR
  node [shape=box, color=blue]
  node1 [style=filled] 
  node2 [style=filled, fillcolor=red] 
  node