The first extensive telegraph network was the visual telegraph. In 1791 the Frenchman Claude Chappe used a visual network (which consisted of a telescope, a clock, a codebook, and black and white panels) to send a message ten miles.
Page Content. The School Performance Profile provides the public with a comprehensive overview of student academic performance in every Pennsylvania public school building, including traditional public schools, charter schools, cyber charter schools and career and technology centers.
Overview Tab. The Overview tab displays graphs of CPU, disk, and network utilization, and a graph showing the rate of hard memory faults on the computer. These graphs can be resized using the Views button. The Overview tab also displays a summary of CPU, disk, network, and memory usage on the system as follows: