From the NannyMUD documentation

LAST CHANGE

2000-12-18

COMMAND



NAME

        echo - echo a message to everyone in the environment

SYNTAX

	echo 

DESCRIPTION

	The string is sent to all players in the same environment as yourself.
	This should be used with great care, and NOT to confuse others or to
	pretend that someone did things he/she/it didn't.

NOTE

	People have been demoted for abusing this.