title: What does OrderCustom=1 mean?
body: <p>I'm looking at the code below and I can't figure out what OrderCustom=1 means.</p>
  
  <pre><code>Selection.Sort Key1:=Range("A1"), Order1:=xlAscending _
      , Header:=xlNo, OrderCustom:=1, MatchCase:=False _
          , Orientation:=xlTopToBottom
  </code></pre>
  
  <p>I've asked google but weren't helped by the first page results. This is also not the first VBA detail question I have not been able to find an answer for. So a bonus question of mine is if you know of a good reference resource where I can lookup things like this?</p>