   changing resolution
  Lets say I start the program with a resolution of 480X640, is there a way to change it to lets say 600X800.  I mean, is there something like a reverse viewport function that instead of returning the resolution changes it?  Is there another way?Thanks.   
  Resolution changes are handled via the operating system, not openGL.  ChangeDisplaySettings & SetWindowRect on windows.   ;  Ok, so how would I do t using the Windows api (win32)? Thanks.   