How does League of Legends send messages to friends in the game?

Method 1: Press Enter in the game to enter the chat box, and then enter the content of "/r" (without quotation marks, there is a space after R). If there is an m in front of your friend, his name will appear directly behind you. If not, please type the name yourself. Then connect the space, then connect the content! The specific format is "/rxxxxx hello!" (xxxx is a friend id)

Method 2: After entering the game, press alt+tab to cut it out at the same time, and a lol icon will appear in the taskbar.

Double-click it and a lol window will pop up.

In this window, you can chat with your friends like waiting for the interface (pay attention to the development of the game).