Echo environment variables

e.g.
<!--#echo var="DATE_ GMT "-->
<!--#echo var="DATE_LOCAL"-->
<!--#echo var="DOCUMENT_ URI "-->
<!--#echo var="GATEWAY_INTERFACE"-->
<!--#echo var="HTTP_ACCEPT"-->
<!--#echo var="HTTP_ACCEPT_ENCODING"-->
<!--#echo var="HTTP_ACCEPT_LANGUAGE"-->
<!--#echo var="HTTP_CONNECTION"-->
<!--#echo var="HTTP_COOKIE"-->
<!--#echo var="HTTP_ HOST "-->
<!--#echo var="HTTP_REFERER"-->
<!--#echo var="HTTP_USER_AGENT"-->
<!--#echo var="QUERY_STRING"-->
<!--#echo var="REMOTE_ADDR"-->
<!--#echo var="REMOTE_ HOST "-->
<!--#echo var="REMOTE_USER"-->
<!--#echo var="REQUEST_METHOD"-->
<!--#echo var="SCRIPT_FILENAME"-->
<!--#echo var="SCRIPT_NAME"-->
<!--#echo var="SERVER_ADMIN"-->
<!--#echo var="SERVER_NAME"-->
<!--#echo var="SERVER_ PORT "-->
<!--#echo var="SERVER_PROTOCOL"-->
<!--#echo var="SERVER_SOFTWARE"-->

fsize and flastmod

e.g.
<!--#fsize file="/images/myimage.gif"--> bytes in size.
Last updated on <!--#flastmod file="/images/myimage.gif"-->

if elif else

e.g.
You are using browser type:
<!--#if expr=" ! $HTTP_USER_AGENT " -->
No user agent specified
<!--#elif expr=" $HTTP_USER_AGENT = /MSIE/ " -->
Microsoft Internet Explorer
<!--#elif expr=" $HTTP_USER_AGENT = /Mozilla/ " -->
Mozilla or something that identifies itself as such (almost everything)
<!--#else -->
Other browser type
<!--#endif -->


Cannot execute system commands

e.g.
<!--#exec cmd="/bin/cal" -->

Cannot execute custom CGI scripts

e.g.
<!--#exec cgi="/test.cgi" -->

Cannot include custom CGI scripts

e.g.
<!--#include virtual="/test.asp" -->
<!--#include virtual="/test.php" -->
<!--#include virtual="/test.cgi" -->
<!--#include virtual="/test.pl" -->

Cannot include pages on remote servers (use a frame instead)

e.g.
<!--#include virtual=
"http://www.somedomain.com/test.html" -->