: Communication must strictly use SIGUSR1 and SIGUSR2 .

: In a separate terminal, run ./client [PID] "Your message here" .

The refers to various community-developed scripts and GitHub repositories used by students at 42 School to validate their Minitalk project . This project challenges students to create a communication protocol between a client and a server using only two UNIX signals: SIGUSR1 and SIGUSR2 . Popular Minitalk Tester Links