title: How do you open a file from within Vim?
body: <p>I know how to open a file in Vim from a terminal (<code>vim fileName</code>). What I can't figure out is how to open a file when I'm already within Vim.</p>
  <p>I tried <code>:r fileName</code>, but that appears to read (or append) the file into the unsaved buffer I have open. It creates a new file, because when I try to write it with <code>:w</code>, it asks for a filename.</p>