HelenOS sources

USB_HIDUT_PAGE_GENERIC_DESKTOP   44 uspace/app/vuhid/hids/bootkbd.c 	STD_USAGE_PAGE(USB_HIDUT_PAGE_GENERIC_DESKTOP),
USB_HIDUT_PAGE_GENERIC_DESKTOP  149 uspace/drv/hid/usbhid/mouse/mousedev.c 	usb_hid_report_path_append_item(path, USB_HIDUT_PAGE_GENERIC_DESKTOP,
USB_HIDUT_PAGE_GENERIC_DESKTOP   47 uspace/drv/hid/usbhid/subdrivers.c 		USB_HIDUT_PAGE_GENERIC_DESKTOP,
USB_HIDUT_PAGE_GENERIC_DESKTOP   55 uspace/drv/hid/usbhid/subdrivers.c 		USB_HIDUT_PAGE_GENERIC_DESKTOP,
HelenOS homepage, sources at GitHub