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+_C_ License Applicability. Except to the extent portions of this file are
+_C_ made subject to an alternative license as permitted in the SGI Free
+_C_ Software License B, Version 1.1 (the "License"), the contents of this
+_C_ file are subject only to the provisions of the License. You may not use
+_C_ this file except in compliance with the License. You may obtain a copy
+_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+_C_ 
+_C_ http://oss.sgi.com/projects/FreeB
+_C_ 
+_C_ Note that, as provided in the License, the Software is distributed on an
+_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+_C_ 
+_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
+_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+_C_ Copyright in any portions created by third parties is as indicated
+_C_ elsewhere herein. All Rights Reserved.
+_C_ 
+_C_ Additional Notice Provisions: The application programming interfaces
+_C_ established by SGI in conjunction with the Original Code are The
+_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
+_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
+_C_ published by SGI, but has not been independently verified as being
+_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
+_C_
+_C_ The first character in this file must be an '_'!
+_C_ Anything on a line after _C_ is ignored
+_define(_filters,eqn)_C_
+_C_      eqn is automatically replaced with neqn for nroff
+_header(IndexMask,control the writing of individual bits in the color index buffers)
+_names(IndexMask)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_phead(_param1)
+Specifies a bit mask to enable and disable the writing of individual bits
+in the color index buffers.
+Initially, the mask is all 1's.
+.SH DESCRIPTION
+_cmnd controls the writing of individual bits in the color index buffers.
+The least significant $n$ bits of _param1,
+where $n$ is the number of bits in a color index buffer,
+specify a mask.
+Where a 1 (one) appears in the mask,
+it's possible to write to the corresponding bit in the color index
+buffer (or buffers). 
+Where a 0 (zero) appears,
+the corresponding bit is write-protected.
+.P
+This mask is used only in color index mode,
+and it affects only the buffers currently selected for writing
+(see _cmnd(DrawBuffer)).
+Initially, all bits are enabled for writing.
+.SH ERRORS
+_const(INVALID_OPERATION) is generated if _cmnd
+is executed between the execution of _cmnd(Begin)
+and the corresponding execution of _cmnd(End).
+.SH ASSOCIATED GETS
+_cmnd(Get) with argument _const(INDEX_WRITEMASK)
+.SH SEE ALSO
+_cmnd(ColorMask),
+_cmnd(DepthMask),
+_cmnd(DrawBuffer),
+_cmnd(Index),
+_cmnd(IndexPointer),
+_cmnd(StencilMask)