(ddd.info)Clustering

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7.3.1.9 Clustering Displays
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If you examine several variables at once, having a separate display for
each of them uses a lot of screen space.  This is why DDD supports
"clusters".  A cluster merges several logical data displays into one
physical display, saving screen space.

   There are two ways to create clusters:
   * You can create clusters _manually_.  This is done by selecting the
     displays to be clustered and choosing `Undisp => Cluster ()'.
     This creates a new cluster from all selected displays.  If an
     already existing cluster is selected, too, the selected displays
     will be clustered into the selected cluster.

   * You can create a cluster _automatically_ for all independent data
     displays, such that all new data displays will automatically be
     clustered, too.  This is achieved by enabling `Edit => Preferences
     => Data => Placement => clustered'.

   Displays in a cluster can be selected and manipulated like parts of
an ordinary display; in particular, you can show and hide details, or
dereference pointers.  However, edges leading to clustered displays can
not be shown, and you must either select one or all clustered displays.

   Disabling a cluster is called _unclustering_, and again, there are
two ways of doing it:

   * You can uncluster displays _manually_, by selecting the cluster
     and choosing `Undisp => Uncluster ()'.

   * You can uncluster all current and future displays by disabling
     `Edit => Preferences => Data => Placement => clustered'.