+it makes ctrl-backspace delete the prev word by making it input C-w.
+Note: keybindings name is specified in profile file, filename.keytab, and at the top of that file.
+
+The \E[4d etc were found without exaplanation in a random stackoverflow
+comment. It seems to just be an unused and useful pattern, where d could
+be any letter. I set them with +AppScreen, but they don't necessarily
+need to be, its just thats the only place I use them, and maybe more
+useful to have the duplicates working outside of emacs.