Main product list is displayed in all sideboxes on a page

To separate data in the lists displayed on the page "special" concept is used. Usually special can be specified like this [b]<inp2.special_PrintList/>[/b] on a template.
However this approach isn't used for products and "list_name" parameter is specified instead of it like this [b]<inp2_PrintList list_name="pick_products"/>[/b]. In this case special is generated based on passed tag parameters and always used, when given "list_name" is specified.

Since In-Portal 5.1.0 concept of main list was introduced. Main list is the list on a page, that has pagination/sorting controls. It's main list, because there can be only one such list on a page. But when you have multiple product lists on a page, then their data can be mixed into a single list, when tag [b]<inp2_InitList list_name="products_in_category" main_list="1"/>[/b] on top of the page.