You can use Debugging Tools for Windows to easily debug drivers, applications and services on systems running Windows NT 4.0, Windows 2000, Windows XP, Windows Server 2003, Windows Vista, and Windows Server codename "Longhorn," as well as for debugging the OS itself. Debugging Tools for Windows package is available in two versions: for 32-bit x86, native Intel Itanium and native x64 platforms. The 64-bit versions of Debugging Tools for Windows allow you to debug both 32-bit and 64-bit user-mode applications running on 64-bit processors. Use this package to debug both the application and the WOW64 emulator.