>I've tried using the program parameter to no avail
>

If you use the ProgID, the server has to be registered on the client machine.

> but have not found a good way of getting the CLSID to try that.


You can get the CLSID from the server box by looking in the registry on the server in HKEY_CLASSES_ROOT under your ProgID, and look at the value in the CLSID key.