SHOW /DIRECTORY

        [DISPLAY\]SHOW Argument [FirstPlane [LastPlane]] /DIRECTORY NameTree
      [/OVERLAY [Variable [Channel]] [/SIDE]

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

    Using  different  "graphic  trees" allows the user to simultaneously display
    (same or different) data in different ways, as each tree inherits a specific
    window.

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