Matthias Moetje wrote: > > > > thanks very much for the info! I had thought PortCls or AvStream was a > kind > > of pre-WDM model. > WDM is a somewhat misunderstood term. Essentially, any driver that gets loaded by plug-and-play (as opposed to service manager) is WDM. Technically speaking, there's more to it than that; a strictly WDM driver uses a reduced set of APIs that allow it to run on Windows 98, but in practical terms that no longer really matters. -- Tim Roberts, timr@xxxxxxxxx Providenza & Boekelheide, Inc.