Still not 100% sure what you're asking here. With CGI, Perl is a server-side scripting language. A button on your web page, if posting to a CGI script, would execute the Perl script on the server, which is the only place Perl can initiate a print function. So if this is the route you can go, a user hitting a web page and clicking on a Print button would post a form to your CGI script, and your CGI script would presumably print something on the server, not the client's printer.
If you're wanting to put a button on an HTML page that prints the current page in the client's printer (as if the user clicked on File | Print in their browser), you can't do this with Perl. Consider JavaScript or some ActiveX/Java component that would communicate with the browser and initiate a print command that way. Perl can't directly interact with a browser. All it does in a CGI context is return content to the browser, typically in the form of an HTML page.
If I'm misunderstanding, by all means elaborate.
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