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