. The version you provide will be saved as you enter it. Leaving
   the text box blank is equivalent to selecting "Default."

<p><b>Note:</b> Running tests under a different runtime or version from the one that NUnit
   is currently using will force them to run in a separate process.

<p><b>Note:</b> To conform with normal usage, specifying Mono as the runtime
   with "1.0" as the version results in use of the Mono 1.0 profile, equating
   to version 1.1.4322.

<h4>ApplicationBase</h4>
<p>The ApplicationBas