Dynamic Data Exchange (DDE) is a Microsoft Windows function. It allows Windows applications to communicate or control other applications on the same computer. OpenOffice Calc supports DDE. DDE can be called with standard Calc function:
Picture below shows an DDE call to WonderWare InTouch application name “View”, topic name is “tagname” and tag name $time.
DDE call is useful to monitor WonderWare Tag value in run time.