I am trying to figure out if I can use AutoCAD as a DDE client. What I would like to be able to do is to dynamically change the color of valves, piping, etc. on a P&ID drawing. I could do this through Excel, but the "originating" program is a DDE server (technically, an OPC server) and would prefer to do it direct. In Excel, all I have to do is to refer to the server, topic name, and tag name, and any time the value changes, the Excel cell is updated (either a 1 or a 0). I would like to be able to do this with AutoCAD. If the value changes to a 1, change the color of the valve to green. If it is 0, change the color to red. Is this at all possible? I have looked in the discussion groups and don't see anything exactly like I am looking for. Also, seems that there is some question as to whether the latest versions of AutoCAD support DDE anymore? Thanks!
