title: continue if the workbook is already open
body: <p>Hello I am working on "Packing list Form (PL)" have a set of codes which opens a "Tracing Form", and copy whatever that is on there to "Packing list Form (PL)" </p>
  
  <p>but when I run the code the second time, "Tracing Form" is already open, 
  so it prompts me saying</p>
  
  <p>""Tracing Form" is already open. reopening will cause any changes you made to be discarded. do you want to reopen "Tracing Form"?"</p>
  
  <p>I want it to say No and continue with the rest of the code !! </p>
  
  <p>please help...
  here's part of the code that's relevant</p>
  
  <pre><code>Set PL = Workbooks("PACKING LIST FORM").ActiveSheet    
  userprofile = Environ$("userprofile")
  
  Workbooks.Open userprofile &amp; "\Dropbox\Tissue Tracing Form"
  
  Set tracingform = Workbooks("Tissue Tracing Form.xlsx").Worksheets("2018_1")
  ActiveWindow.WindowState = xlMinimized 
  
  'execution
  from_lastrow = ActiveSheet.Cells(Rows.Count, 3).End(xlUp).row
  .
  .
  .
  .
  </code></pre>