+[[https://github.com/waymondo/ido-exit-target][ido-exit-target]] let you open file/buffer on =other-windows= when call =ido-switch-buffer=
+
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+
+ (use-package ido-exit-target
+ :ensure t
+ :init
+ (define-key ido-common-completion-map (kbd "C-j") #'ido-exit-target-other-window))
+
+#+END_SRC
+
+* Key bindings
+
+** Remove prefix =ESC=, refer [[http://emacs.stackexchange.com/questions/14755/how-to-remove-bindings-to-the-esc-prefix-key][here]]