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VSCRNSCRL()

    Oh no!  Not another screen trick?! Yes, indeed.  VSCRNSCRL()
    displays your screen in vertical scrolling fashion, forcing
    whatever was already on the screen off from top to bottom.

    To use VSCRNSCRL(), first paint your screen then call HBLINDSAVE()
    as previously described to save your screen to a screen file.

    When you want to restore the screen with the horizontal scroll
    effect, call VSCRNSCRL() as follows:

    VSCRNSCRL(<screen file>)

    Required Parameter

    <screen file> is the name of the file containing the saved screen.

    Sample Usage

    Please refer to the pseudo-code that accompanies the discussion on
    PULL_DRAPE() and SAVE_DRAPE() for tips on how to intelligently
    incorporate VSCRNSCRL() in your program.

    Clipper 5.0 Notes

    The Clipper 5.0 version of this function accepts an optional
    directional parameter (thanks to Evan Davies).

    VSCRNSCRL(<screen file> [, <nDirection> ])

    Optional parameter <nDirection> determines whether the display will
    be pull-down or pop-up.  Pass 1 for pop-up, -1 for pull-down.
    (Default is pull-down.)