A communications system transmits messages via a wireless network to multiple users nearly simultaneously in real-time. Each user has a terminal that receives a message and plays the message for the user. The terminal may also wait for the user to verbally acknowledge the arrival of the message before continuing with its normally executing application. The sender of the message may track, for each intended recipient, the delivery of the message, the accessing of the message by the user, and the acknowledgement by the user that the message was understood.