Since Logitech first started producing all kinds of multimedia keyboards, the keyboard has transformed into a console with all sorts of system functions from the original pure-text input tool. But most of our keyboards do not come with these convenient function keys, such as volume control keys, media play keys, etc. So is it possible to modify the default keyboard keys to support launching/calling the system functions? The answer is yes.
Above all things, you have to know what port forwarding/port mapping is. Port forwarding refers to the mechanism of packets forwarding. Its essence is firewall's configuration strategy. But its function mainly focuses on packets forwarding, in order to achieve the purpose of operating specific packages (IP address parsing and filtering based on destination port number). As a consequence, it is generally taken out as an independent concept.