How does World of Warcraft send messages to all players?

/P is a group conversation, for example, you form a team to do copywriting.

/RAID is a team term, meaning more than 5 copies.

/Y is shouting, that is, the scarlet letter, which will let people farther away see what you said.

/1 is a comprehensive channel.

/2 is the transaction channel.

/3 is the local defense channel.

(Generally, only the main city has trading channels)

/S is a lingua franca, which means that the person in front of you can see you talking.

/BG talking on the battlefield

R is to reply to someone's secret message to you.

/G is a speech in the guild

That's basically it.