Function Returns the column coordinate of the upper-left corner of the active or specified window.
In Visual FoxPro, you can also specify the name of a toolbar. You can also use the empty string for WindowName to specify the main Visual FoxPro window. If you specify the name of a system window that is closed, Visual FoxPro generates an error message. The Debug window is an exception. Windows can be positioned outside the main Visual FoxPro window.