A method of instantaneous communication (for means of instantaneous travel, see
Farcaster) in the
science fiction novels
Hyperion,
The Fall of Hyperion,
Endmyion, and
The Rise of Endmyion. The
Ousters refer to this method of communication as
The Void Which Binds.
By means of fatline,
Hegemony citizens can
login to the
datasphere, through
implants or a
comlog.
The Consul, a character in the novels, has an ancient comlog that he can use to send messages, but not receive them (except from his nearby ship).