Earlier quoted context omitted.
Multiplexed sockets. Dead reckoning.
I remember a lot of dead reckoning happening in the old Runescape, once upon a time. Many moments of your player running in a direction then getting rubber-banded back because they got interrupted or something.
Extreme example of someone using this in PVP: https://www.youtube.com/watch?v=kIFWSMW6Lzo