The document discusses the topics and activities for Day 4 of a course. It includes a lab on counter circuits and 7-segment displays, sequential logic circuits like D flip-flops, a lab on timer and counter circuits, a discussion of electronic circuits, finite state machine circuits, and a review plan for Day 5. It also briefly discusses using CPLDs for programmable logic controller applications by interfacing them with a computer using Verilog and the Altera design software Quartus.