They have FTL communication in the form of FTL ships carrying messages. The details of how the FTL works have not been discussed in comic, but it involves ships that look like push pops and freezing people.
The FTL drive is called the DAVE* Drive. And that is basically the only information we have.
* Dangerous And Very Expensive
There's no wrong way to play. - S. John Ross
Originally Posted by archaeo
Man, this is just one of those things you see and realize, "I live in a weird and banal future."