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DDE Connections on Newer Operating Systems (Win 7 / Server 2008 / etc.)

I need to run OmniServer as a Windows service but my DDE Client cannot connect to OmniServer.  What is the problem?

If you are using DDE, you won't be able to run OmniServer as a system service on Windows 7 and newer, as DDE cannot interact between an interactive process and a system service.

Newer operating systems have changed the way that applications and services run.  They run in different "sessions" that cannot interact with each other.

If you must make a DDE connection from your client application, i.e. it doesn't support other options such as OPC or Suitelink, you will have to run OmniServer as a standalone application/process instead of a system service.