Iris is an instant messaging system used within the universe. It may be accessed from every terminal and from dedicated mobile units.

Peers are identified using numeric talk groups. Negative numbers are mobile units. This is an incomplete list of talk groups identified so far:

• -945: PETR
• 0: ITOPS
• 1: Dr. J Marvin Blackweather / Red terminal
• 78: The Rock
• 100: MO1
• 109: AIR1
• 110: AIR1
• 112: AIR1, Cockpit
• 117: AIR1
• 119: AIR1
• 201: MO5 (previously MO3)
• 211: AIR2
• 223: MO2
• 284: Material order desk
• 303: Robert Bramble (older)
• 411: Directory assistance
• 555: MO5
• 609: MO6, Bridge
• 660: Shadow Team
• 808: Honolulu Tape Retrieval System
• 1010: MO1, Kitchen
• 1919: Robert Bramble (newer)
• 6941: Jessie Sandra
• 10283: TRANSP
• 15034: Debra Fisher
• 16001: Esprit Boursicot
• 16009: The Rock, Room 101 / Green terminal
• 16921: The Rock, Room 104 / Amber terminal
• 17001: Desiree Martin
• 19001: Hilo, Room 101 / Aqua terminal
• 39232: Friendly code desk
• 45021: The Rock, Room 107
• 54091: FACILITY, Bridge
• 54099: FACILITY, Comms room
• 77777: Mark Zorb