Study of computer systems emphasizing impact on application level programming. Virtual memory and memory management; code optimization; system-level I/O; concurrency: processes, threads, synchronization; introduction to network programming. Course Information: Extensive computer use required. Prerequisite(s): Grade of C or better in CS 251 and Grade of C or better in CS 211; and CS 261. Class Schedule Information: To be properly registered, students must enroll in one Lecture-Discussion and one Laboratory.