> 4.1 | Driver Integration

> As is common for Windows CE device drivers, the serial USB driver is built as a dll. The dll exports the standard USB interface accessed by the operating system in order to install or uninstall the driver and to attach or detach the corresponding USB device, if its hardware has been located on the USB bus by the USB host driver. In addition, the dll exports the device context interface of the virtual COM port and presents it to the system with the device name "VCU". It is also possible to apply a multiplex driver to that device.
> Figure 5: Serial USB Driver Integration System
> For more information on how to integrate and operate the Siemens serial USB driver see [7].