... 22.4Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7thEdition, Jan 14, 2005 Operating System Services Operating System Services One set of operating- system services provides functions ... execution2.8Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7thEdition, Jan 14, 2005User Operating System Interface User Operating System Interface - - GUIGUI User-friendly desktop metaphor ... and Gagne ©2005 Operating System Concepts – 7thEdition, Jan 14, 2005Layered Operating System Layered Operating System 2.24Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7thEdition,...