Exiting from GNU Screen: ctrl-A ctrl-\?

#1

From section Exiting on page Using uLisp from a terminal of uLisp’s site:

To exit from screen :

* Type ctrl-A ctrl-\ and answer y to the prompt.

Shouldn’t it be ctrl-A \?

#2

From man screen:

C-a C-\     (quit)        Kill all windows and terminate screen.
#3

C-a C-\ does nothing on Linux Mint with Screen 4.09.01 whereas C-a \ works as expected. Here’s Screen’s help screen:

                       Screen key bindings, page 1 of 2.

                       Command key:  ^A   Literal ^A:  a

  break       ^B b         license     ,            removebuf   =         
  clear       C            lockscreen  ^X x         reset       Z         
  colon       :            log         H            screen      ^C c      
  copy        ^[ [         login       L            select      '         
  detach      ^D d         meta        a            silence     _         
  digraph     ^V           monitor     M            split       S         
  displays    *            next        ^@ ^N sp n   suspend     ^Z z      
  dumptermcap .            number      N            time        ^T t      
  fit         F            only        Q            title       A         
  flow        ^F f         other       ^A           vbell       ^G        
  focus       ^I           pow_break   B            version     v         
  hardcopy    h            pow_detach  D            width       W         
  help        ?            prev        ^H ^P p ^?   windows     ^W w      
  history     { }          quit        \            wrap        ^R r      
  info        i            readbuf     <            writebuf    >         
  kill        K k          redisplay   ^L l         xoff        ^S s      
  lastmsg     ^M m         remove      X            xon         ^Q q      


                  [Press Space for next page; Return to end.]
#4

Must be a difference in the versions of Unix.

#5