(HTML)
<a href="www.example.com/cgi-bin/openwindow.cgi">

...User clicks link and starts CGI below

(CGI) - Open Window
...basic PERL header stuff here..
print "Content-type: text/html\n\n";
print <<HMTL
<scirpt>
window.open('security_modify_information.htm'
  ,'mywindow','width=400,height=550,left=30
</script>
JAVA

(HTML - Security_modify_information.htm)
This is a form, upon submit, it checks the form fields and upon completion, it does the following:

<script>
window.close ();
</script>