An acronym for Private Message, Graal's ingame player-to-player communication system. Players can send PMs to any number of other players on the same server, and stating with Graal4 also to players on other servers. PMs can also contain HTML code to add flashy and cool effects.
To send a PM, press F7 to show the playerlist. Then double click on the player you want to PM. (or right click and then left click "Message") You can also select select several players by holding Ctrl and left click all you want to PM. Or by holding shift you can easily select all players in between the two you select.