An orphan process is a process that has been terminated but whose parent has not yet called wait().

The degree of multiprogramming refers to the number of processes in memory.

Entitlements are commonly used in Linux system protection.

Microsoft Windows uses the one-to-one thread mapping model.

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

Linux distinguishes between processes and threads.

The heap section is the section of process memory that is dynamically allocated during process run time.

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

It is possible to have concurrency without parallelism.

Protection is not one of the major categories of system calls.