List of all environment variables?

[fork]

Is there a way to get all the environment variables in a session?

I know about getenv() and putenv(), I was hoping for the shell equivalent of
"env".

The broader context is that I want to make a program I wrote available via CGI.
I am still debating whether it is easier to hassle parsing envars in octave or
to use a wrapper in some other more www friendly language.

Tx