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IMAGER allows to display at the same time the results of several SHOW, VIEW, INSPECT, EXPLORE or COMPARE command. For this, it uses the directory tree structure offered by the graphic library, which allows to associate a specific graphic window to any part of the plot.
By default, all plots are made in the <GREG tree, with its window. Using /DIRECTORY TreeName option with the above commands allow them to make their plot in a separate tree <TREENAME with its own window. The new window becomes the active one: any cursor action (e.g. DRAW) relates to it, until the user explicitely uses the CHANGE DIRECTORY command, or a new plotting command with no /DIRECTORY option is used.
The DIRECTORY option is semi-sticky: consecutively repeating the same command with the same argument re-uses the same tree, even if the option is no longer specified. However, using a different plotting command reverts to the default (or specified) tree and window.