USB products have the ability to embed a unique serial number for each product into the low level descriptors that are accessed by the host controller drivers when the product is plugged into the USB bus. In turn, the serial number of a product can be used to identify the product. The device serial number can be set through the USB Serial Number Control panel.
MProg can generate unique serial numbers automatically for you (recommended). These consist of a 2 letter prefix (e.g. FT) followed by 6 alphanumeric digits generated using an algorithm based on the date and time of programming the device. It is also possible to fix the serial number to a fixed 8-digit alphanumeric string, however we do not recommend this as systems will only recognise the first instance of such a device connected to a PC.