Click on a URL where? Obtain the value where? (i.e. what is the relationship between the software recording the click, the software making the http request, and the URL being requested (is it your site? various different 3rd party sites? a site that is generated by one of the afore mentioned pieces of software?)

A form is used in an HTML document when you want the user to enter some data - pretty much anytime you don't want to give them a list of choices (as they can be represented by regular links). From your description it doesn't sound like you need that.

CGI.pm is a nice, mature bit of software. While you can read $ENV directly, using the CGI.pm interface will probably be more elegent for basic functions, and protect you from silly mistakes in less trivial functions (such as parsing query strings). So use CGI.pm.

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