A serial link is used to communicate with another computer through the serial ports.
Creating a session (using the IDirectPlay3::Open method) causes a dialog box to appear asking the user to configure the serial port. The IDirectPlay3::EnumSessions method will also display a dialog box asking the user to configure the serial port. You must configure the serial port the same way on both computers.
If you insert too many delays into the message processing, you may lose packets; for example, if you print a lot of debug information.
This service provider can be identified using the symbol definition DPSPGUID_SERIAL.