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During emulation, if you are using a character backend multiplexer
(which is the default if you are using ``-nographic``) then several
commands are available via an escape sequence. These key sequences all
start with an escape character, which is Ctrl-a by default, but can be
changed with ``-echr``. The list below assumes you're using the default.

Ctrl-a h
   Print this help

Ctrl-a x
   Exit emulator

Ctrl-a s
   Save disk data back to file (if -snapshot)

Ctrl-a t
   Toggle console timestamps

Ctrl-a b
   Send break (magic sysrq in Linux)

Ctrl-a c
   Rotate between the frontends connected to the multiplexer (usually
   this switches between the monitor and the console)

Ctrl-a Ctrl-a
   Send the escape character to the frontend