This is the main screen. It shows a list of Wi-Fi signals.
It is indeed an "interesting" piece of software, mostly because it is often the source of great confusion for Windows users. realtek usb wireless lan utility
For the average user, the Realtek USB Wireless LAN Utility is redundant bloatware. It is usually better to install just the driver (often found in a folder named "Driver" inside the installation USB) and let the native Windows Wi-Fi manager handle the connection. This is the main screen
If you are reading this guide because the utility isn't working, here is the checklist: realtek usb wireless lan utility
If you open the Realtek USB Wireless LAN Utility, you are greeted with a very retro interface. Here is how to read it: