So even if you have a fullscreen app running, you can use the overlay window to keep track of your system. The overlay window always stays on top of other windows. The info panel shows the most important information in a separate window. Every menu bar widget can be configured to show information. You can add as many menu bar widgets as you like.
Use the Dashboard to take a look at the most important parameters. All information can be shown in both the menu bar extra and the overlay window. This includes CPU load, memory usage, network speeds and -traffic and the open network connections.
