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\chapter{Introduction}
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HelenOS is an development operating system intended to
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be a testbed for research in the field of operating
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systems and system-level programming. This manual is
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a guide for building, running and enhancing HelenOS.
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The system, as any other operating system, can be divided
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into platform independent and platform dependent parts.
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An user space program could be written in such
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a way that it can be compiled and executed on any
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of the platforms HelenOS supports without any modifications.
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However it might work as a device driver or perform
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other special tasks and thus being platform dependent.
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\section{Structure of HelenOS}
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The HelenOS system cosists of three major parts:
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\begin{itemize}
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 \item Kernel
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 \item User space tasks
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 \item Boot infrastructure
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\end{itemize}