DriverSpyNT is an advanced I/O request packet (IRP) monitoring tool for Windows NT/2k/XP. DriverSpyNT can monitor and display IRPs sent to any device on the system. Additionally, it has the powerful feature of displaying the input and output buffers of device I/O control requests. These features make DriverSpyNT an instrumental tool for debugging device drivers, discovery of undocumented IOCTLs, and learning more about the NT I/O subsystem