Virtual Serial Ports Driver (VSPD) is a Windows device driver. Using it you can create any number of virtual serial COM ports in your system which will be virtually connected to each other. For example, after installing VSPD, you will have Virtual Serial Port COM5 and Virtual Serial Port COM6 added to your system. These ports will behave like real common serial ports to other Windows applications.

ZylGPSReceiver is a Delphi/CBuilder component that ... component that communicates with a serial GPS receiver. It returns latitude, longitude, ... connected to one of the serial ports. You can use it also ... these devices usually have a driver that redirects the input from the ... this component in the download package.

ZylGSM is a Delphi & C++Builder ... connected to one of the serial ports. You can use it ... because these devices have a driver that redirects the input from ... the USB, infrared or bluetooth port to a virtual serial port ... can check it in System/Device Manager/Modems).