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Some laptops use a FnLock toggle to change the behavior of the function keys in the context of shifting with a blue Fn key. But if F4 is really a function key and not "mute my microphone", Ctrl-Alt-F1 to F7 switches virtual terminals. The GUI is often on tty7, the system teleports from there to tty4 which isn't yet logged in, and users who don't know about virtual terminals won't know how to get back to tty7 by pressing Ctrl-Alt-F7. Some people use the word "prank" after they suggest Ctrl-Alt-F4 as the solution to a newbie's IRC query but that's mild compared to Ctrl-Alt-backspace. I don't think I've seen an OS which switches virtual terminals just by pressing F4 or Alt-F4 on their own. I think I've seen Ctrl-Alt-1 to 7 switch virtual terminals, using numerics rather than function keys, in the past, but that could be wrong. In Firefox, Alt-1 to 9 switches to tab 1 to 9. On Tue, 20 Oct 2020 at 08:56, Neil <barnaby@xxxxxxxxxxxx> wrote: > > I have set up several keyboard shortcuts using Ctrl-Alt plus another > key. For example Ctrl-Alt-x to open Firefox, Ctrl-Alt-b for Thunderbird. > However to open the terminal screen I just use the F4 function key by > itself. > > I am so used to the Ctrl-Alt plus another key combination that I suspect > I am sometimes automatically typing in Ctrl-Alt-F4 for the terminal, > instead of just plain F4. > > If I do enter Ctrl-Alt-F4 what will happen? I have done some research, > but as usual cannot find a definite answer. > > Thanks, > > Neil > > -- > The Mailing List for the Devon & Cornwall LUG > https://mailman.dcglug.org.uk/listinfo/list > FAQ: http://www.dcglug.org.uk/listfaq -- The Mailing List for the Devon & Cornwall LUG https://mailman.dcglug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/listfaq