diff -r 5fee9f3276aa -r eeda6f41f8e5 emacs.rst
--- a/emacs.rst	Sat Aug 21 17:09:00 2010 +0300
+++ b/emacs.rst	Tue Aug 24 22:49:55 2010 +0300
@@ -99,23 +99,41 @@
 With transient-mark-mode and delete-selection-mode enabled: select region,
 type M-| sort -u RET to replace selection with sorted and uniquified lines.
 
-** Determining running environment.
+** Determining running environment/platform.
 
-Check such variable:
+Check variables:
 
   emacs-major-version
   emacs-minor-version
-  window-system - 'nil' if in terminal, 'w32' if native Windows build, 'x' if under X Window.
-  window-system-version
-  operating-system-release
-  system-configuration - like configuration triplet: cpu-manufacturer-os
-  system-name
+  window-system             - 'nil' if in terminal, 'w32' if native Windows build, 'x' if under X Window
+  window-system-version     - for windows only
+  operating-system-release  - release of the operating system Emacs is running on
+  system-configuration      - like configuration triplet: cpu-manufacturer-os
+  system-name               - host name of the machine you are running on
   system-time-locale
-  system-type
+  system-type               - indicating the type of operating system you are using:
+                              'gnu' (GNU Hurd), 'gnu/linux', 'gnu/kfreebsd' (FreeBSD),
+                              'darwin' (GNU-Darwin, Mac OS X), 'ms-dos', 'windows-nt', 'cygwin'
   system-uses-terminfo
   window-size-fixed
 
-Run such checks:
+and check functions:
+
+  (fboundp ...)             - return t if SYMBOL's function definition is not void
+  (featurep ...)            - returns t if FEATURE is present in this Emacs
+  (display-graphic-p)       - return non-nil if DISPLAY is a graphic display; graphical
+                              displays are those which are capable of displaying several
+                              frames and several different fonts at once
+  (display-multi-font-p)    - same as 'display-graphic-p'
+  (display-multi-frame-p)   - same as 'display-graphic-p'
+  (display-color-p)         - return t if DISPLAY supports color
+  (display-images-p)        - return non-nil if DISPLAY can display images
+  (display-grayscale-p)     - return non-nil if frames on DISPLAY can display shades of gray
+  (display-mouse-p)         - return non-nil if DISPLAY has a mouse available
+  (display-popup-menus-p)   - return non-nil if popup menus are supported on DISPLAY
+  (display-selections-p)    - return non-nil if DISPLAY supports selections
+
+Run those checks as below:
 
   (when window-system ...)
   (when (eq window-system 'x) ...)
@@ -215,3 +233,8 @@
 
   hanoi hanoi-unix life pong tetris gomoku
 
+* Long lines.
+
+  (setq longlines-show-hard-newlines t)
+  (setq longlines-wrap-follows-window-size t)
+  (longlines-mode 1)