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<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>
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            </topic>
