There are a number of so called "environment" variables that are known and possibly logged whenever you access a page on the WWW. These variables and their values when you accessed this page are shown below. The variable name is on the left, its value on the right.
HTTP_X_CC_ID=ccc01-02 HTTP_HOST=local.wasp.uwa.edu.au HTTP_USER_AGENT=CCBot/1.0 (+http://www.commoncrawl.org/bot.html) HTTP_ACCEPT=text/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 HTTP_ACCEPT_LANGUAGE=en-us,en;q=0.5 HTTP_ACCEPT_ENCODING=gzip HTTP_ACCEPT_CHARSET=ISO-8859-1,utf-8;q=0.7,*;q=0.7 HTTP_CONNECTION=close HTTP_CACHE_CONTROL=no-cache HTTP_PRAGMA=no-cache PATH=/sbin:/usr/sbin:/bin:/usr/bin SERVER_SIGNATURE=<address>Apache/2.2.2 (Fedora) Server at local.wasp.uwa.edu.au Port 80</address> SERVER_SOFTWARE=Apache/2.2.2 (Fedora) SERVER_NAME=local.wasp.uwa.edu.au SERVER_ADDR=192.65.130.137 SERVER_PORT=80 REMOTE_ADDR=38.107.191.85 DOCUMENT_ROOT=/var/www/html SERVER_ADMIN=support@wasp.uwa.edu.au SCRIPT_FILENAME=/home/staff/pbourke/public_html/oldstuff/wwwknow/index.html REMOTE_PORT=44819 GATEWAY_INTERFACE=CGI/1.1 SERVER_PROTOCOL=HTTP/1.1 REQUEST_METHOD=GET QUERY_STRING= REQUEST_URI=/~pbourke/oldstuff/wwwknow/ SCRIPT_NAME=/~pbourke/oldstuff/wwwknow/index.html DATE_LOCAL=Monday, 23-Nov-2009 14:26:41 WST DATE_GMT=Monday, 23-Nov-2009 06:26:41 GMT LAST_MODIFIED=Tuesday, 28-Aug-2007 20:07:11 WST DOCUMENT_URI=/~pbourke/oldstuff/wwwknow/index.html USER_NAME=pbourke DOCUMENT_NAME=index.html