Is DCOM absolutely needed MS app to MS app communication?

Is DCOM absolutely needed MS app to MS app communication?

My app is a Cold Fusion 5.0 based web application. It sits on a PC that is on the network but all the ingredients are on the same PC.
It (my app) uses a CGI method to call a VB 6.0 executable. This VB executable call/triggers MS Visio 2000 as below:

Set appVisio = CreateObject("visio.application")
Set docObj = appVisio.Documents.Open(destFile)

DCOM is somehow detected by some testing group and it causing a security concern; I do not what would happen if it is disabled on the PC housing my app. I know for sure that COM in involved. I also know this:

“Distributed COM (DCOM) is a subset of COM that provides the capability to use COM objects across networks or across the Internet. DCOM extends COM to provide the mechanism for using COM in a networking environment. A detailed discussion of DCOM is beyond the scope of this book, but note that DCOM is definitely prevalent in certain types of network programming.”