title: Do Sinatra (rack) applications have "TempData" like ASP.NET MVC has?
body: <p>In asp.net mvc there is a method called <code>TempData</code> used for holding  temporary data. Is there anything similar to it in Sinatra?</p>
  
  <p><strong>UPDATE</strong>: it became <strong>TempData</strong>. </p>