> 4 | USB Modem in Windows CE Environment

> To integrate a USB modem into a Windows CE 5.0 environment with USB host controller, Siemens WM provides the source code required to generate the usbser.dll, i.e., the serial USB driver. This driver realizes a virtual COM port for the operating system in order to access the module on its USB interface by means of this COM port. For details on the integration and operation of the “serial USB driver” please refer to [7].