Use of NetDDE requires the proper settings of DDE Share on all nodes with which WebAccess will be interfacing. NetDDE relies on Windows Security. The logged on Windows User on the Client must be recognized user by the Net DDE Server computer (i.e. must be a user on both machines with the same user name and password). For a first time developing a NetDDE application, it is recommended to log on with the same user name and password on both the NetDDE Server PC and the Client.