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SMG$CHANGE_VIEWPORT

   The Change the Viewport Associated with a Virtual Display routine
   changes the size of an existing viewport in a virtual display.
   The text currently in the viewport is remapped to fit the new
   dimensions.

   Format

     SMG$CHANGE_VIEWPORT  display-id [,viewport-row-start]

                          [,viewport-column-start]

                          [,viewport-number-rows]

                          [,viewport-number-columns]

Additional information available:

Returns         Arguments