well quick keys for the systems are controled, after assignments, by the number kets. At the bottom of the radio displat you see numbers and or stars. Stars, the system is turned off, a number showing, its turned on. now for a specific system to turn it on, while leaving the others off, fastest way I have found is turn all systems off, then turn the one you want back on and you will scan only that system.. You can assign number keys to a specific channel/frequency which is another way to use quick keys. Its not really a quick key but it functions very similar. The subject of group keys, system keys, and number keys is read and read and read.