GUI (Graphical User Interface) A type of user interface that allows users to interact with electronic devices visually.System Call The interface for accessing the kernel of the operating system. Switches from user mode to kernel mode through a system call. Prevents direct access to computer resources and protects programs. Uses a mode bit flag variable (0 = kernel mode, 1 = user mode).Kerne..

유저 프로그램 - User Program하드웨어 - Hardware Structure of an Operating SystemGUI (Graphical User Interface)A type of user interface that allows users to interact with electronic devices visually.System Call_시스템콜The interface for accessing the kernel of the operating system.Switches from user mode to kernel mode through a system call.Prevents direct access to computer resources and protects programs.Use..