phpinfo()

[Anon]

after installation of apache ,php,tomcat if i use phpinfo()
the value for
SERVER_SOFTWARE =

Apache/1.3.12 (Unix) tomcat/1.0 PHP/4.0.0

but whereas in some other sites the value is
Apache/1.3.17 (Unix) mod_bwlimited/0.8 PHP/4.0.4pl1 mod_perl/1.24 mod_log_bytes/0.2

what is the main purpose of mod_bwlimited, and how we can load this module , how can this be displayed in SERVER_SOFTWARE variable?

[neuromancer]

Apache sets this enviorment variable, I would check out there site for more information.