How to display my wordpress widget programmatically?
Why the need to include custom widget programatically. I mean you can simply create another sidebar that is shown only on your custom page template "product"
Further as you need to do it for your custom page, you don't even need to check for any condition. Simply put this code in your "prdouct" page template file anywhere ( where you would like to display your sidebar".
<?php if (function_exists('dynamic_sidebar') && dynamic_sidebar('Product Sidebar')) ;?>And simply drag your widget to this sidebar from admin panel.