COMPARE /DIRECTORY

        [DISPLAY\]COMPARE LeftSet RightSet /DIRECTORY NameTree

      Display the graphics under the user specified  <NameTree  "graphic  tree",
    instead  of the usual <GREG tree. The tree is created if needed, cleared and
    activated.

    A few names should not be used:  VSIDE, POPUP, CCT because they are  already
    used by some specific plotting routine.