should be.
Why do we say ``or it should be''? When Emacs starts up using a
-window system, it determines automatically which key or keys should be
+graphical display, it determines automatically which key or keys should be
equivalent to @key{DEL}. As a result, @key{BACKSPACE} and/or @key{DELETE}
keys normally do the right things. But in some unusual cases Emacs
gets the wrong information from the system. If these keys don't do
@cindex Delete Selection mode
@cindex mode, Delete Selection
@findex delete-selection-mode
- Many window systems follow the convention that insertion while text
+ Many graphical applications follow the convention that insertion while text
is selected deletes the selected text. You can make Emacs behave this
way by enabling Delete Selection mode---with @kbd{M-x
delete-selection-mode} or using Custom. Another effect of this mode
commands are useful with text in multicolumn formats, and for changing
text into or out of such formats.
+@cindex mark rectangle
When you must specify a rectangle for a command to work on, you do it
by putting the mark at one corner and point at the opposite corner. The
rectangle thus specified is called the @dfn{region-rectangle} because