playing adventure games. The only limitation is that extensions are
restricted to the functionality provided by Emacs's built-in set of
primitive operations. For example, you can interact and display data by
-manipulating the contents of an Emacs buffer, but you can't popup and
+manipulating the contents of an Emacs buffer, but you can't pop-up and
draw a window with a layout that is totally different to the Emacs
standard.