Change size of other window
Use FindWindow function to find handle of the foreign window and MoveWindow function to change position and dimensions of this window.
procedure TForm1.Button1Click(Sender: TObject); var MyHandle: THandle; WinRect: TRect; begin MyHandle:=FindWindow(nil, 'Delphi Help'); GetWindowRect(MyHandle, WinRect); MoveWindow(MyHandle, WinRect.Left, WinRect.Top, 300, 300, True); end;