title: Using OpenGL /GLUT how would I detect if two keys are held down at the same time?
body: <p>Using OpenGL /GLUT how would I detect if two keys, say 'a' and 'j' are held down at the same time?</p>
  
  <p>(This program needs to compile with OSX GCC, Windows GCC, Windows VS2005 so no OS dependent hacks please.)</p>