Hello
I have now tested the DDE Server with three programs 
  running.
1)Trading Platform with DDE Server running.
2)Microsoft 
  Excel 2007 running and displaying and updating prices 
from DDE 
  server.
3)Amibroker is running with universal data plugin and 
  configured as
explained by Marcin Gorzinski, with the plugin Status 
  remaining 
Yellow, data bars are being retrieved.
4)Prices being 
  displayed in Amibroker RealTime Quote Window are not
the same as displayed 
  in the trading platform or Microsoft excel.