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Use ClipCursor function, which allows you to confine mouse moving in some area.

//Confine mouse
procedure TForm1.Button1Click(Sender: TObject);
var
  Rect: TRect;
begin
  Rect.Left:=Left;
  Rect.Top:= Top;
  Rect.Right:=Left+Width;
  Rect.Bottom:=Top+Height;
  ClipCursor(@Rect);
end;

// Free mouse
procedure TForm1.Button2Click(Sender: TObject);
begin
  ClipCursor(nil);
end;

Related chapters

Forms

Related topics

Show/hide mouse cursor

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Delphi Help
Win32 Programmer's Reference

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