Multitasking / Concurrency / Parallel Processing Context switch Scheduling Preemptive Cooperative / Coroutines Kernel - Monolithic / Micro Kernel Mode Logical address = virtual address Spooling Lisp Machine Synchronous / Asynchronous i/o Device Driver Xwindows Daemon Posix Kernel Panic Prefetch Blue Screen of Death Access Control List - ACL Embedded Job and JCL Batch WYSIWYG GIGO Pseudo Teletype - PTY Multics Master Boot Record - MBR Time slice Real Time AT&T Distributed File System, NFS Yellow Pages, now NIS Kernel Tracing Unimplemented Operation - UUO Hibernate Hierarchical file system MINIX