tsugaru,

Well, it was surely a good learning exercise for you.

Don't give up. Gather your energy and start again.

Some more...tip-tops:

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X11

X11 is a graphics display system with a network-transparent client-server architecture.

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XFree86

XFree86 is an Open-Source implementation of X11.

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MacOS X

Is a UNIX-based operating system produced by Apple Computer, and offers a unique combination of technical elements. The graphics engine in MacOS X is called Quartz and the look and feel is called Aqua.

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Darwin

Darwin is the Open Source release of the Mac OS X operating system. Is available free of charge and with full source code. It does not contain Quartz, Aqua, or any other related technology.

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MacOS X and X11 (XFree86) work together

In X11, the top window, called the root window, is the size of the screen and contains all other windows and also the desktop background. As a standalone graphical environment it has full control over the screen.

In MacOS X it is Quartz (the graphics engine) who has full control of the screen.

There are 2 ways for making these environments work together:

1.Fullscreen (rooted mode)
The two environments take turns and each of them take full control of the screen. We see only one at a time, but it's very easy to switch between them.

2.Rootless mode
Mixing the two environments. Letting Quartz take care of the desktop background, eliminating the X11 top window or root window. That's why this mode is called 'rootless'. This way eliminates the need to switch between two screens.

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XDarwin

XDarwin is the name of the X server which runs on systems using Darwin or Mac OS X. XDarwin provides the mechanism for switching which graphics system controls the screen.

Double clicking on the XDarwin.app will show you a dialog window where you can choose between 'fullscreen' and 'rootless' mode.

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Cheers...