WinXfer is a versatile file transfer utility that allows transferring files between two computers directly connected through the serial port or through a modem. It has three interfaces. The first uses the standard Windows (GUI) interface that allows the user to run it as a simple Windows application. The second is a command line console interface that can be used either from the command prompt, spawned from another application or command file, or run from the Windows scheduler. The third is an application programming interface that allows a Visual C/C++, Visual Basic, and any tool capable of calling DLLs to access all features programmatically.