Thanks - That's now using SATVLtransfer.exe which is what he uses now and unfortunately won't disclose any more about it except he got the idea from a friend. It writes to a file and I do not have that device.
I have the version before that on my device which writes direct to any application that is open when the device is plugged in. It uses a program called V-USB to do the transfer, which I have ,but the bit I am asking for detail of is the fact that it puts data into whatever application is open. I don't understand how it does that? I should state it is all in the programming on the attiny45 chip that is supplied with the device