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Scroll your form with PgUp and PgDn

 

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Form scrolling is accomplished by modifying the VertScrollbar or HorzScrollbar position properties of the form.
The following code demonstrates how to do this:

procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
const
  PageDelta = 10;
begin
  with VertScrollbar do
  if Key = VK_NEXT then
    Position := Position + PageDelta
  else if Key = VK_PRIOR then
    Position := Position - PageDelta;
end;
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