@xj9@social.heldscal.la I remember CTRL+R and CTRL+T being used to start and stop a teleprinter I used WAY long ago, but Wikipedia tells me that XON and XOFF flow control was actually CTRL+Q and CTRL+S (all four keystrokes correspond to Device Control 1-4 in ASCII). Maybe my teleprinter was non-standard. But to answer your question, I don't really know. I was just passing on an interesting tidbit from that other social microblogging platform.