title: Can NSIS scripts add 2 integers & 'OR' a StrCmp
body: <p><strong>Is it possible to add 2 numbers together in Native NSIS(not using libraries)?</strong></p>
  
  <pre><code>Var hasVersion9    # values will either be 0 or 1
  Var hasVersion10
  Var hasVersion9Or10
  
  IntCpy $hasVersion9Or10 hasVersion9+hasVersion10
  (IntCmp $hasVersion9Or10 1 OR IntCmp $hasVersion9Or10 2) doThis doThat
  </code></pre>
  
  <p><strong>Is it also possible to perform an 'Or' operation in a string comparision?</strong></p>
  
  <pre><code>StrCmp $myVar ("1" OR "11") doThis doThat
  </code></pre>