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<p>on top of udev.</p>

<p>Some other operating systems which don't have an alternative like udev or devd still use HAL.</p>

<p>The purpose of the hardware abstraction layer was to allow <a href="page.php?w=application_software">desktop applications</a> to discover and use the <a href="page.php?w=computer_hardware">hardware</a> of the host system through a simple, <a href="page.php?w=Software_portability">portable</a> and <a href="page.php?w=abstraction_%28computer_science%29">abstract</a> <a href="page.php?w=API">API</a>, regardless of the type</p><p>
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