title: How to effectively use Vim: wildmenu
body: <p>I'm a bit confused about the use of Vim's menus. I have <code>set wildmenu</code> and <code>set wildmode=list:longest,full</code> but I don't understand for the life of me how to invoke and use the completion feature.</p>
  <p>Is this feature useful? Why and how? What kind of completion does this do exactly? In other words, what determines the completion list content?</p>
  <p>Any tips and example usages would be appreciated.</p>