What does f5 do in a computer? The F5 key is commonly used to refresh or update the content of a desktop window or a webpage in Internet Explorer. The Alt+F4 keyboard combination is typically used for closing a window. In Mac OS X 10.3 and later, F9 through F11 are used to activate the Exposé feature.What is f5 command? The Command F5 Project is a resource dedicated to encouraging Designers and Developers to create software that is accessible to all users.What is a f5 vpn client? The F5 Networks VPN Client for Windows is a program that allows a user to initiate and use Network Access, App Tunnel, and Terminal Services sessions outside the context of an Internet browser.What is a f5 network device? The F5 vulnerability, first discovered and disclosed to F5 by cybersecurity firm Positive Technologies, affects a series of so-called BIG-IP devices that act as load balancers within large enterprise networks, distributing traffic to different servers that host applications or websites.