User's Manual

GNU Free Documentation License

Version 1.2, November 2002

51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

Everyone is permitted to copy and distribute verbatim copies of this license document, but changing

it is not allowed.

PREAMBLE

The purpose of this License is to make a manual, textbook, or other functional and useful

document "free" in the sense of freedom: to assure everyone the effective freedom to copy and

redistribute it, with or without modifying it, either commercially or noncommercially.

Secondarily, this License preserves for the author and publisher a way to get credit for their

work, while not being considered responsible for modifications made by others.

This License is a kind of "copyleft", which means that derivative works of the document must

themselves be free in the same sense. It complements the GNU General Public License, which

is a copyleft license designed for free software.

We have designed this License in order to use it for manuals for free software, because free

software needs free documentation: a free program should come with manuals providing the

same freedoms that the software does. But this License is not limited to software manuals; it

can be used for any textual work, regardless of subject matter or whether it is published as a

printed book. We recommend this License principally for works whose purpose is instruction

or reference.

APPLICABILITY AND DEFINITIONS

This License applies to any manual or other work, in any medium, that contains a notice

placed by the copyright holder saying it can be distributed under the terms of this License.

Such a notice grants a world-wide, royalty-free license, unlimited in duration, to use that work

under the conditions stated herein. The "Document", below, refers to any such manual or

work. Any member of the public is a licensee, and is addressed as "you". You accept the

license if you copy, modify or distribute the work in a way requiring permission under

A "Modified Version" of the Document means any work containing the Document or a portion

of it, either copied verbatim, or with modifications and/or translated into another language.

A "Secondary Section" is a named appendix or a front-matter section of the Document that

deals exclusively with the relationship of the publishers or authors of the Document to the

Document's overall subject (or to related matters) and contains nothing that could fall directly

within that overall subject. (Thus, if the Document is in part a textbook of mathematics, a

Secondary Section may not explain any mathematics.) The relationship could be a matter of

historical connection with the subject or with related matters, or of legal, commercial,

philosophical, ethical or political position regarding them.

The "Invariant Sections" are certain Secondary Sections whose titles are designated, as being

those of Invariant Sections, in the notice that says that the Document is released under this

License. If a section does not fit the above definition of Secondar

then it is not allowed to be