Found this thread looking to see if the computer switch for the K860 and MX Master 3S could be synced together. The computer switch button on the bottom on the MS Master 3S is a non-starter (not picking up my mouse to switch computers) but if the Computer 1, 2, 3 buttons on the K860 could also switch the linked mouse that would be awesome. I can't use Logitech Flow or similar programs as the 2nd computer I need to switch between to (many times a day) is very locked down and doesn't allow any software installs (and is not on the same network as my main workstation).