The SET WINDOW command allows you to assign a name to a screen
    window. A screen window is a region on the terminal screen
    through which you can view a display. You must specify the
    window in terms of a starting line number on the screen and a
    line count. Once defined, a window name can be used in subsequent
    DISPLAY and SET DISPLAY commands.

    PCA provides a substantial number of predefined window names. You
    can list all defined window names using the SHOW WINDOW command.