This module is contained in the mod_env.c file, and
is compiled in by default. It provides for
passing environment variables to CGI/SSI scripts. Is is only available
in Apache 1.1 and later.
Summary
This module allows Apache's CGI and SSI environment to inherit
environment variables from the shell which invoked the httpd process.
CERN web-servers are able to do this, so this module is especially
useful to web-admins who wish to migrate from CERN to Apache without
rewriting all their scripts