Communication in both directions. A can talk to B and B can talk to A, but only one can talk to the other at a time, such as walkie-talkies. Show contributors This page has been seen 1,071 times. Created by Arez on Aug 12, 2013 Contributors: erosing
Communication in both directions. A can talk to B and B can talk to A, but only one can talk to the other at a time, such as walkie-talkies.
