@main is one of the exclusive commands found in MouRO, being it's function basically of allowing a player to send a message to the entire server in the form of a broadcast. This command is constantly used for chatting when there are just a few players playing in the server, or for when people are searching for a party.
To use this command, a player must type @main before any sentence he/she wants to send to the entire server, like the example below:
The player wants to say to the entire server: "Anyone up to a party?"
To broadcast this message, the player must type: "@main Anyone up to a party?"
It is possible to deactivate @main broadcasts by simply typing @main alone. To activate @main just type it again.