Possible Clues:

• Influencing each other
• Bury law? I have, responding to input
• (Of two things) influencing each other
• Responding to each other in recitative, man or woman finally compromised
• Communicating with others in a group
• Showing mutual influence
• Two-way computer communication, together effective
• Sort of program to bury undead?
• Able to afford two-way communication, they're oddly doing nothing about it