Aircraft call in over the radio. Speak your instructions with the callsign first; pilots read back and fly exactly what they read back, so listen for mistakes. Keep 3 nm or 1,000 ft between aircraft.
Arrivals: vector to intercept the final east of the field at 3,000 ft or below, clear the ILS approach, then clear to land. Departures: clear for takeoff, then hand off.
Pilots: …
You: …
Use headphones. Say the callsign first, then heading, altitude, speed. Your voice goes to Co-Star live. Audio is not saved; your transcript, actions and summary are saved to your account.