ColdFusion is an automation (late-binding) COM client. As a result, the COM object must support the IDispatch interface, and arguments for methods and properties must be standard automation types. Because ColdFusion is a typeless language, it uses the object's type information to correctly set up the arguments on call invocations. Any ambiguity in the object's data types can lead to unexpected behavior.

In ColdFusion, you should only use server-side COM objects, which do not have a graphical user interface. If your ColdFusion application invokes an object with a graphical interface in a window, the component might appear on the web server desktop, not on the user's desktop. This can take up ColdFusion server threads and prevent further web server requests from being serviced.

ColdFusion can call Inproc, Local, or Remote COM objects. The attributes specified in the cfobject tag determine which type of object is called.