WriteConsole
From the Scripting Manual
procedure WriteConsole(ID: byte; Text: string; Colour: longint); Parameter Info: ID (Byte): Player ID to write text to. Set to 0 to write to all players! Text (String): Text to be written to the console. Will be prefixed with ' [*] ' to prevent exploiting. Colour (Longint): Colour the text should be when drawn to the console. Description: This function will add text to the players(ID) console. Note that all message are prefixed with ' [*] ' to prevent scripters from spoofing other console messages. Set ID to 0 to write the text to ALL Players in the server!
Examples
begin
WriteConsole(0,'Pickled Onions are nice!',$EE81FAA1);
// Will draw: " [*] Pickled Onions are nice!" to ALL players consoles.
// $EE81FAA1 is the colour, in AA RR GG BB format. (Alpha, Red, Green,Blue);
end;