[MSDN Library June 1998] 3.5.1 Getting a System-assigned Interrupt Vector, DIRQL, and Processor Mask (33.260492959262%)
MSDN Library Visual Studio 6.0 > DDK Documentation > Microsoft Windows NT 4.0 DDK > Kernel-Mode Drivers > Design Guide > Chapter 3 NT Objects and Support for Drivers > 3.5 Interrupt Objects