title: How are opengl menus that go outside of the window implemented?
body: <p>I was looking at how sometimes when you right click, the menu goes outside of the window. </p>
  
  <p>Is this implemented with a separate window? If so, how can I get this functionality. I am trying to use GLFW, but I understand if it isn't possible. </p>
  
  <p>Currently I am on windows, but I like keeping my options open, which is why GLFW would be preferable. </p>
  
  <p>I noticed that GLUT has such a feature. If you are confused to what I am looking at then look at that. </p>
  
  <p>Thanks for any help!!</p>