8.1.  Ctrl-Alt-Del (Boot)


  If you press Ctrl-Alt-Del (or whatever key was assigned the keysym
  Boot by loadkeys) then either the machine reboots immediately (without
  sync), or init is sent a SIGINT. The former behaviour is the default.
  The default can be changed by root, using the system call reboot(),
  see ctrlaltdel(8).  Some init's change the default. What happens when
  init gets SIGINT depends on the version of init used - often it will
  be determined by the pf entry in /etc/inittab (which means that you
  can run an arbitrary program in this case).  In the current kernel
  Ctrl-AltGr-Del is no longer by default assigned to Boot.



  8.2.  Other combinations



  Name            Default binding
  -------------------------------
  Show_Memory     Shift-Scrollock
  Show_Registers  AltGr-ScrollLock
  Show_State      Ctrl-ScrollLock
  Console_n       Alt-Fn and Ctrl-Alt-Fn  (1 <= n <= 12)
  Console_{n+12}  AltGr-Fn                (1 <= n <= 12)
  Incr_Console    Alt-RightArrow
  Decr_Console    Alt-LeftArrow
  Last_Console    Alt[Gr]-PrintScreen
  Scroll_Backward Shift-PageUp
  Scroll_Forward  Shift-PageDown
  Caps_On                                 (CapsLock is a toggle; this key sets)
  Compose         Ctrl-.



  8.3.  X Combinations



  Ctrl-Alt-Fn     Switch to VT n
  Ctrl-Alt-KP+    Next mode
  Ctrl-Alt-KP-    Previous mode
  Ctrl-Alt-Backspace      Kill X