NameVirtualHost & <VirtualHost> in Apache, unless you need to do thousands, in which case look for 'mass vhost' on
http://httpd.apache.org/ Mass VHost can also be done using mod_rewrite.
Tux does it automatically, but requires your docroot to be set up in a specific way
AOLServer requires multiple ns_sock statements and a funny frontend.tcl configuration
Caudium requires the Virtual Host Matcher module and uses regexp's and a master domain to do the backend redirection.
Boa requires a VirtualHost Directive and a specific directory layout
thttpd requires vhost directives in the command line upon invocation
zeus does it through their web admin system, and doesn't require a restart
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