Add BROWSER as a standard environment variable.
See the BROWSER page at http://www.tuxedo.org/~esr/BROWSER/ for discussion.

--- environ.5	2001/01/24 11:36:57	1.1
+++ environ.5	2001/01/24 11:42:54
@@ -24,9 +24,9 @@
 .\" 
 .\" Modified Sun Jul 25 10:45:30 1993 by Rik Faith (faith@cs.unc.edu)
 .\" Modified Sun Jul 21 21:25:26 1996 by Andries Brouwer (aeb@cwi.nl)
-.\" Modified Mon Oct 21 17:47:19 1996 by Eric S. Raymond (esr@thyrsus.com)
 .\" Modified Wed Aug 27 20:28:58 1997 by Nicolás Lichtmaier <nick@debian.org>
 .\" Modified Mon Sep 21 00:00:26 1998 by Andries Brouwer (aeb@cwi.nl)
+.\" Modified Wed Jan 24 06:37:24 2001 by Eric S. Raymond (esr@thyrsus.com)
 .\"
 .TH ENVIRON 5 "October 21, 1996" "Linux" "Linux Programmer's Manual"
 .SH NAME
@@ -89,6 +89,14 @@
 .TP
 .BR EDITOR / VISUAL
 The user's preferred utility to edit text files.
+.TP
+.B BROWSER
+The user's preferred utility to browse URLs.  May actually consist
+of a sequence of colon-separated browser commands to be tried in
+order until one succeeds. If a command part contains %s, the URL is
+substituted there, otherwise the browser command is simply called
+with the URL as its first argument.
+.\" See the BROWSER project page at http://www.tuxedo.org/~esr/BROWSER/  
 .PP
 Further names may be placed in the environment by the \fBexport\fP
 command and `name=value' in \fBsh\fP(1), or by the \fBsetenv\fP command