typedef enum _PCI_HOTPLUG_SLOT_INTERRUPT
{
         SlotInterruptPresenceDetect = 0,
         SlotInterruptLatchChange = 1,
         SlotInterruptAttentionButton = 2,
         SlotInterruptPowerFault = 3,
         SlotInterruptMaximum = 7
} PCI_HOTPLUG_SLOT_INTERRUPT;

Windows Vista Kernel Structures