While Martin is a very good developer, I don't believe he is a magician or has somehow managed to circumvent the laws of physics :mrgreen:
As we can safely assume that WinSCP uses the standard internet protocols, the best place to start is to read about them, specifically SCP and SFTP:
WinSCP is also open source and the code is freely available to read and understand:
Implementation details may vary but generally there is no black magic involved in file transfer protocols.
SCSI on the other hand...
"Getting a SCSI chain working is perfectly simple if you remember that there
must be exactly three terminations: one on one end of the cable, one on the
far end, and the goat, terminated over the SCSI chain with a silver-handled
knife whilst burning *black* candles."