My Questions

1. I cannot access the Windows Accessibility Options in
    Visual Basic 6.0 by this:
    x=Shell("rundll32.exe shell32.dll,Control_RunDLL _
         access.cpl,,5")

2. What is the following sentence function in Perl 5?
     open(IN,"sample.txt");
     @Unique=();
     while (<IN>){
          unless($i{$_}++){push(@Unique,$_)}
      }

3. When I developed some CGI Script, I found I cannot
    pass extra path information to my Perl program. Such
    as:
    <HTML>
     ...
     <FORM ACTION="/cgi-bin/shopping.pl/catalog.html"
                 METHOD="POST">
     ...
     </HTML>
     I like to run my shopping.pl and send the catalog.html
     to the client, but it does nothing.