How does cf display the names of teammates?

In cf game, if you want to display the name of your teammate, there is a key on the keyboard. Press insert to bring out the name, and then press it to disappear.

Crossing the line of fire is a first-person shooter game developed by SmileGate in Korea and operated by Tencent Computer System Co., Ltd. in Shenzhen.

The game tells the duel story of GlobalRisk and BlackList, two major mercenary groups in the world. There are many modes in the game, team mode, team game, blasting mode, ghost mode and so on. The instant joining system in the form of "lack of people to make up" was introduced.