Sep 21	 lecture notes -- web perl 

 I)   go over homework

 II) CGI input mechanism

     i.   <form> tag, POST vs GET
          * in theory  : does it change the server?
	  * practice   : do I want it to show up in the URL?
          see on-campus/
     ii.  %ENV hash and CGI
     iii. examples: on-campus/testing/show-env.cgi
     iv.  back quotes, "escape to shell boo-boo"
     v.   taint mode
     vi.  URL encoding

 III) start persistence of state 
     i.  cookies
     ii. URL's with malleable links

 IV) CPAN and "use Foo";

 V)  CGI.pm (if time allows; otherwise on Thurs)

 VI) the assignment - on webpage