You are looking at the Emacs tutorial.
Emacs commands generally involve the CONTROL key (sometimes labelled
-CTRL or CTL) or the META key (sometimes labelled EDIT). Rather than
+CTRL or CTL) or the META key (sometimes labelled EDIT or ALT). Rather than
write out META or CONTROL each time we want you to prefix a character,
we'll use the following abbreviations:
C-<chr> means hold the CONTROL key while typing the character <chr>
Thus, C-f would be: hold the CONTROL key and type f.
- M-<chr> means hold the META or EDIT key down while typing <chr>.
- If there is no META or EDIT key, type <ESC>, release it,
+ M-<chr> means hold the META or EDIT or ALT key down while typing <chr>.
+ If there is no META key or equivalent, type <ESC>, release it,
then type the character <chr>. "<ESC>" stands for the
key labelled "ESC".
the cursor always in the window where you are editing, and edit
there as you advance through the other window.
+C-M-v is an example of a CONTROL-META character. If you have a real
+META key, you can type C-M-v by holding down both CTRL and META while
+typing v.
+
+It doesn't matter whether CTRL or META "comes first," because both of
+these keys act by modifying the characters you type. But if you don't
+have a real META key, and you use ESC instead, the order does matter:
+you must type ESC followed by CTRL-v; CTRL-ESC v will not work. This
+is because ESC is a character in its own right, not a modifier key.
+
>> Type C-x 1 (in the top window) to get rid of the bottom window.
(If you had typed C-x 1 in the bottom window, that would get rid