What is XDarwin?
	XDarwin is an implementation of the window server for version 11 of the X window system on the Darwin operating system, underlying Mac OS X. Information on where to download and how to compile and install XDarwin is available at xfree86.org. Perhaps the best way for new users to think about XDarwin is in relation to the other architectural components of Mac OS X. Below is a diagram showing the layers of Mac OS X. The top layer shows application environments, with Carbon and Cocoa being Apple's preferred development methods. The next layer down indicates the appearance level. A Window manager is necessary for the user to be able to manipulate windows, just as Aqua and the Platinum appearance allow Mac users to move, close, or resize windows. XDarwin, like Quartz and QuickDraw, provides a fundamental method for allowing applications to draw to the screen. The lowest layer is occupied by the core operating system, Darwin.

	XFree86 License
	Version 1.1 of XFree86 Project License. Copyright (C) 1994-2004 The XFree86 Project, Inc. All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: Redistributions of source code must retain the above copyright notice, this list of conditions, and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution, and in the same place and form as other copyright, license and disclaimer information. The end-user documentation included with the redistribution, if any, must include the following acknowledgment: "This product includes software developed by The XFree86 Project, Inc (http://www.xfree86.org/) and its contributors", in the same place and form as other third-party acknowledgments. Alternately, this acknowledgment may appear in the software itself, in the same form and location as other such third-party acknowledgments. Except as contained in this notice, the name of The XFree86 Project, Inc shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The XFree86 Project, Inc. Version 1.0 of XFree86 Project License. Copyright (C) 1994-2003 The XFree86 Project, Inc. All Rights Reserved. XFree86 code without an explicit copyright is covered by the following copyright/license: Copyright (C) 1994-2001 The XFree86 Project, Inc. All Rights Reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE XFREE86 PROJECT BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of the XFree86 Project shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from the XFree86 Project. Note that parts of the XDarwin source are copyrighted by individual authors and third-parties and may have different licensing terms.