Now he uses a "SATVLTransfer code which does the same thing. I do not understand how it gets into the applications automatically?
Yes I do not use Windows or any silly VB code
Still not quite sure what you're asking, so pardon me if this is obvious - the serial characters come across the usb connection, and the satvltransfer.exe apparently receives them and saves them to a file. Is that the part you're asking about - save them to a file? I would assume they are just taking the data in whatever format it's coming over in, separating out the different variables, and formatting the data into a .csv format, and saving it to a file on your computer. If you're not familiar, .csv stands for comma separated values. You just write a text file that contains all of your data, separated by commas, with a newline character between rows. Rename it to .csv, and you can open it with open office or excel.
Example of the formatting...