Final answer:
Windows NT employs a message-passing mechanism for input/output operations, enhancing system abstraction, security, and stability.
Step-by-step explanation:
Windows NT uses a message-passing implementation for I/O. This method involves the communication of I/O requests between the device drivers and the kernel using a secure and structured system of messages rather than direct memory or processor access. In Windows NT architecture, this allows for better abstraction, security, and stability of the system as I/O operations are encapsulated in well-defined messages that are passed between system components.