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In this video we cover what happens behind the scene when you run a program in Windows and Linux.

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Multi-process applications like Discord spawn multiple background processes automatically. On Windows, the CreateProcess system call directly creates new processes by specifying an executable and command-line arguments. Unix/Linux systems use a two-step approach: fork() clones the calling process entirely (including memory and CPU state), then execve() replaces the child process with a new program. The fork() return value (0 for child, child PID for parent) allows processes to differentiate execution paths. This fork-exec pattern is how nearly all user processes are created on Unix-like systems, forming a process tree rooted in a single init process.

The Logic Behind Multi Process Applications