This help page is a how-to guide.
It details processes or procedures of some aspect(s) of Wikipedia's norms and practices. It is not one of Wikipedia's policies or guidelines, and may reflect varying levels of consensus and vetting.
There are a number of software notices to display message(s) to broad sets of Wikipedians.
Shows to all users on all projects (or all users in a specific language, depending). Controlled at meta:Special:CentralNotice. See also meta:CentralNotice.
Shows to all anonymous users; if blank, the sitenotice shows to anons as well. Appears above the page title. Controlled by MediaWiki:Anonnotice. Not dismissable.
Shows to all users who are able to edit the page. Appears above the edit textarea. More information available at Wikipedia:Editnotices.