SoftICE (Software In-Circuit Emulator) was a that ran "underneath" the Windows operating system. Unlike standard application-level debuggers that run as processes within Windows, SoftICE could suspend the entire operating system, including the kernel, to allow for line-by-line inspection of system-level code. Why SoftICE was Unique:

He set the breakpoint and typed BLINK . The cursor pulsed faster. Then, X .

DriverStudio was a comprehensive integrated development environment (IDE) designed to simplify the creation, testing, and debugging of Windows device drivers (WDM, WDF, and NT). SoftICE 4.3.2

was an integrated suite of tools designed for the development, testing, and debugging of device drivers for Windows operating systems. Released by Compuware’s NuMega Lab, it provided a comprehensive environment that bridged the gap between standard application development and complex kernel-mode programming. Key Components of DriverStudio 3.2