[Connor gestures in the direction of the mana pool with his left hand. There's a large, hexagonal rock over there with chalk writing scribbled all over it, because that's what passes for a network here. He doesn't mind, because he lives in front of a mana pool, but.]

The rock over there. You can write messages on it - sixth side is for trading announcements and stuff, so if the other five are full just erase whatever looks oldest.