Validation Technologies International: www.validationtech.com

Matrix: www.hwlvegas.com/new-bill_acceptors.htm

libhid: alioth.debian.org/projects/libhid

libusb: libusb.sourceforge.net

USB HID specifications v1.11: www.usb.org/developers/hidpage

USB HID Usage Tables (HUT) v1.11: www.usb.org/developers/hidpage

Hotplug examples: cvs.ailab.ch/cgi-bin/viewcvs.cgi/external/libphidgets/hotplug

usbsnoopy: www.wingmanteam.com/usbsnoopy is a newer version, it has a nice XML output that makes the snoop easier to read

usbsnoop: benoit.papillault.free.fr/usbsnoop older snoop, as used in this document.

MGE hidparser: www.mgeups.com/opensource/projects/hidparser.htm

“Snooping the USB Data Stream” by Greg Kroah-Hartman: /article/7582