Check out the howto.

-derby

update: I'm not a apache 2.2 expert by anymeans but I think you're going to want something like this in your httpd.conf: 

<Directory /usr/local/apache/htdocs/*/cgi-bin>
  Options +ExecCGI
</Directory>

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That being said ... I think one of the drawbacks to your approach is your exposing way too much of your underlying architecture. User's are going to see something like this: 
http://bioinfo-z.comp.nus.edu.sg/Test/cgi-bin/foo
http://bioinfo-z.comp.nus.edu.sg/WebApp1/cgi-bin/bar
http://bioinfo-z.comp.nus.edu.sg/WebApp2/cgi-bin/baz

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I think a better approach would be to either use virtual servers: 
http://test.comp.nus.edu.sg/cgi-bin/foo
http://webapp1.comp.nus.edu.sg/cgi-bin/bar
http://webapp2.comp.nus.edu.sg/cgi-bin/baz

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Or something like CGI::Application 
http://bioinfo-z.comp.nus.edu.sg/cgi-bin/test?mode=foo
http://bioinfo-z.comp.nus.edu.sg/cgi-bin/webapp1?mode=bar
http://bioinfo-z.comp.nus.edu.sg/cgi-bin/webapp2?mode=baz

[download]

In reply to Re^3: Enabling CGI Script from Apache's htdocs directory by derby
in thread Enabling CGI Script from Apache's htdocs directory by monkfan

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