UNDERGROUND Info Page 3.

You can start communicating by entering messages in the box below. You can now say something like: Hello. You can also hit the Bell icon (top right) to cause a chime in the other computer's speakers if they are active.

Only people with an UNDERGROUND USB Stick from the same package and the correct Master Password can communicate with each other. One of the ingredients to generate the Advanced Security Keys (ASK) is the Master Password. Without the correct Master Password there is no matching ASK. Without a matching ASK, there is no possibility to decrypt your messages.

Below is a sample screen shot of the communication screen.