title: Partially click-through transparent window ontop of desktop using OpenGL
body: <p>I want to render graphics seemingly on top of the Windows desktop. There are a lot of solutions for rendering <a href="https://stackoverflow.com/questions/112224/click-through-transparency-for-visual-c-sharp-window-forms">transparent</a> and <a href="https://stackoverflow.com/questions/4052940/how-to-make-an-opengl-rendering-context-with-transparent-background">click-through</a> windows. However, I want some of the rendered sprites to be clickable. How would I got about doing this?</p>
  
  <p>I'm using C# on Windows and was planning to use OpenTK. If this is unfeasible please explain.</p>