This at the beginning of this page
%%commentbox Commentbox at the top right of the page __see also__\\ [DontCreateMe] %%
produces the commentbox at the top right of this page.
This in the middle of the text
%%commentbox Commentbox in the middle of the page __see also__\\ [DontCreateMe] %%
shows a comment somewhere at the right side.
Maybe someone knowledgeable describes the exact positioning of commentboxes.