Destinations
A destination carries a name, an address, a port and a profile. Show markers, for their part, carry no IP address: they aim at a destination by its name.
That is what makes arriving at a venue and finding the console at 192.168.1.20 rather than 10.0.0.5 cost one setting, not reopening forty markers. And it is exactly the kind of thing you find out an hour before doors.
Destinations are stored outside the show, in %LOCALAPPDATA%\WinShow\tempo.json. That is deliberate: no show is open at startup, and you must be able to send a tempo on a night with no cue list.