I've added an reference to assembly "Interop.QuotesPlus.dll" in my solution, so a namespace QuotesPlus became visible with several classes inside. It seams to be machine generated IDispatch wrapper classes created with ClassWizard.
After a first use of any of that classes' method, it locks internal database that I need to get released. This DLL is listed in Process.GetCurrentProcess().Modules but I'm not sure if it is possible to unload a module (and load it back later). Please suggest.