"Hide products from customer groups for Separate Pricing Per Customer" was adapted from the "Hide products from groups of customers" contribution (http://www.oscommerce.com/community/contributions,2597) that was written for other contributions. All credits go to the original developer Stonez Chen (see http://forums.oscommerce.com/index.php?showtopic=104149). This modification enables hiding of products from customer groups on the product level. You can hide for example products that you only sell to special customers or wholesale customers from visitors and retail customers.