page <playername>=<message>
This command sends a message to any other player currently online. You may send messages to more than one player at a time by using spaces in between the player names. If the player you specify is disconnected or hidden, their @away message will be displayed. If the player is idle, or hasn't typed in any command longer than five minutes, their @idle message will be displayed. If the player is currently not accepting pages and has their @plock attribute set against you, you will see their @haven message. Examples:
p gandalf=What is the airspeed velocity of an coconut-laden swallow?
page gandalf zythis=Hi there, admins!