title: VBA catch the "calculate sheet (shift+f9)" and "calculate workbook" events
body: <p>I don't know if this is trivial or actually hacky to do : is it possible to catch the "calculate sheet (shift+f9)" and "calculate workbook" events in VBA ?</p>
  
  <p>I want to hide some processes that manipulate a few thousands lines, to just display some key values. I am calculating a distribution, the thousands lines, and want to just output the percentiles and some stats, as well as the graph instead of all these lines. At the moment I was thinking of a classic macro button, but my users are keener on the F9 way of life..</p>
  
  <p>Do you think I'm pointing towards something interesting with what I suggest in the title ?</p>