Linux systems initially adopted the "System V INIT" approach, but recent distributions have replaced it with "systemd."

A parallel system can perform more than one task simultaneously.

For each program, the text and data sections can shrink and grow dynamically during program execution.

A process that has terminated but whose parent has not yet called wait() is known as an init process.

As processes enter the system, they are put into a wait queue.

The first-in, first-out (FIFO) algorithm will replace the page that will not be used for the longest period.

A "blocking send()" and "blocking receive()" are known as "blocked messages."

On a mobile device, the foreground application is the app that does not appear on display.

A process control block (PCB) is also called a task control block.

The program counter of a process contains temporary data such as function parameters, return addresses, and local variables.