How to design a Twain DS for a web cam

I would like to make a Twain data source for use with a web cam we use as part of our application.

We have been using a universal driver called Videods.ds which is usually ok but as it saves a temp file to the root of "C" it cant be used on tightly controlled computers.

We would like to write our own Twain data source file so we can simply drop the *.ds file into the Windows\twain32 folder, select it from our application.

We DO NOT want to talk to the web cam directly form our application as we often change web cams as companies like Logitech tend to drop older models quite regularly.

Please suggest!!!

via Chebli Mohamed