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A COM port is a type of serial port that complies with the following additional requirements:
You access the COM port through an instance of the COM port device interface class. The GUID for this class is GUID_DEVINTERFACE_COMPORT, which is defined in Ntddser.h.
You operate the COM port by using the 16550 UART-compatible interface that is defined in Ntddser.h.
To ensure compatibility with most applications that access COM ports, you should assign a symbolic link name that uses the standard naming convention
COM<n>, where<n>is the COM port number (for example, COM1). If you use aCOM<n>name, you must obtain the COM port number<n>from the COM port database. COM port numbers should only be used withCOM<n>names.
By default, the combined operation of the class installer for the Ports device setup class and the Serial function driver configure a device as a COM port.
For information about how the Ports class installer and Serial function driver create a COM port device interface for a COM port, see External naming of COM ports.