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GLUT, the Open GL Utility Toolkit, provides functions to handle window events, create simple menus etc.
Here, we just use it to set up a valid Open GL context (allowing us access to the graphics hardware through the GL API later on) with as few code lines as possible.
Additionally, this approach is completely independent of the window system that is actually running on the computer (MS-Windows or Xfree/Xorg on Linux / Unix and Mac).
Most of the features that are required to perform general floating-point computations on the GPU are not part of core Open GL.
The accompanying code uses two external libraries, GLUT and GLEW.