OK, thanks. So, is this how it works: - Go to folder "test-1" on computer A, get a secret, - Go to folder "test-2" on computer B, put a secret from "test-1", Now BitTorrent Sync on computer B will sync "test-2" with "test-1". Questions are: - is "test-1" now master, or BT Sync simply updates the last changed one, - I just want to update a single file, not a whole folder, how can I prevent undesirable updating?