When pressing both C at the same time, the combination is recognized as C-M on a Win7 machine and Emacs 24.5.

I've stumbled on this by mistake while pressing C-C-SPC. While on a Linux machine, this is the same as C-SPC, on a Windows machine this is recognized as C-M-SPC. This is very handy, but I'm not able to reproduce the behaviour on Linux.

Any ideas on how I might achieve this on Linux or why is it working only on Windows?

Update for Windows:

  • If I start emacs with no init files (emacs -q), the behavior is still present (i.e. C-C-SPC is still recognized as C-M-SPC)
  • If I start emacs without the window system (emacs -nw) the behavior disappears (i.e C-C-SPC is recognized as C-SPC), as expected.
  • This is something handled at the OS level rather than by emacs, I believe.
    – Dan
    Commented Feb 19, 2016 at 20:34
  • @Dan, donno, but pressing C-C-DEL outside of emacs, does not invoke the C-M-DEL, so Windows doesn't do this conversion for the ctrl+alt+del, for example.
    – mihai
    Commented Feb 19, 2016 at 20:39
  • Just to check -- it's not the case that in Emacs, one of the control keys is mapped to Meta, is it?
    – zck
    Commented Feb 21, 2016 at 19:39
  • 1
    @zck, no, it is not. I use both Ctrl keys, the left one for navigating, for example, the right one for saving, find-file, etc. While trying to set mark, I accidentally pressed both Ctrls at the same time. Instead of set-mark I got select-word, or something like that. Two seconds later and a C-h k, indeed, C-C-SPC was actually a C-M-SPC and not a C-SPC as I was expecting, and as is the case on Linux.
    – mihai
    Commented Feb 22, 2016 at 5:15
  • Learn something new everyday! I never thought to hold both Control keys down as modifiers. I would have thought that it was redundant. Whoodathunk?
    – Drew
    Commented Aug 15, 2016 at 1:47


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