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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE topic
PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="usb-implementation-notes">
<title>Implementation Notes for Windows and Linux Hosts</title>
<body>
<p>On Windows hosts, a kernel mode device driver provides USB proxy support. It implements both a USB
monitor, which enables <ph conkeyref="vbox-conkeyref-phrases/product-name"/> to capture devices when they are
plugged in, and a USB device driver to claim USB devices for a particular virtual machine. System reboots are not
necessary after installing the driver. Also, you do not need to replug devices for <ph
conkeyref="vbox-conkeyref-phrases/product-name"/> to claim them. </p>
<p>On supported Linux hosts, <ph conkeyref="vbox-conkeyref-phrases/product-name"/> accesses USB
devices through special files in the file system. When <ph conkeyref="vbox-conkeyref-phrases/product-name"/> is
installed, these are made available to all users in the <codeph>vboxusers</codeph> system group. In order to be
able to access USB from guest systems, make sure that you are a member of this group. </p>
</body>
</topic>
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