wp_list_pages – help exluding pages

In this code: http://codex.wordpress.org/Function_Reference/wp_list_pages#List_current_Page.2C_ancestors_of_current_page.2C_and_children_of_current_page

I’d like to exclude some pages from displaying, but in $sidelinks = wp_list_pages() it’s not working, so I thing I should put it somewhere else (maybe in $result) but I do not know how.

Also, how would it be possible to list all the subpages when in a subpage, like in http://codex.wordpress.org/Function_Reference/wp_list_pages#List_subpages_even_if_on_a_subpage ?

Thanks a lot 😉