title: Programatically transfer file to R Shiny application
body: <p>I have the following situation/workflow:</p>
  <ol>
  <li>The user utilizes Tool A to capture sensor data and save it to a CSV file.</li>
  <li>The user takes the CSV and uploads it to a R Shiny Applications (using <code>fileInput</code>) to process it further.</li>
  </ol>
  <p>I would like to get rid of the intermediate CSV and directly open the Shiny application with the data already loaded. I.e. I need a way to transfer the contents of the CSV automatically to the Shiny application.</p>
  <p>What could work:</p>
  <ol>
  <li>Tool A stores the CSV in a special location that is served by a HTTP server on a fixed endpoint.</li>
  <li>The Shiny application requests the file from the known location on startup.</li>
  </ol>
  <p>However, this still needs the intermediate CSV file, and adds complexity by introducing an additional server (or at least endpoint). Furthermore it needs additional logic if multiple users are active / multiple files are created at the same time. So it is far from ideal.</p>
  <p>Is there any way to get the contents of the CSV directly from Tool A to the Shiny Application? E.g. by mimicking the messages the 'fileInput' widget produces?</p>