Normally you would use the program help (F1), because it provides a range of search functions.
However, sometimes it could make sense to use the online help. Possibly the manuals of the internal program help are not accessible or you would like to have a look at home without having PARTsolutions available or may be you would like to have a look on a more current version.
External call of the site in the browser via http://b2b.partcommunity.com/community/pages/manual?page=partsolutions_en/v11/index.html