inf icons line

hi,
in a sample inf file in line with HKR,,icon,,-5... I am not sure what -1,-5 , etc stands for?. where is the list of such icon listings?.

INF files can list a DLL where device icons are provided as icon resources. The -1, -5 is the icon group's index number, and the icon's index within the group.

Drivers can provide their own DLL's, or borrow an existing icon from a default Windows DLL file. You can use ResourceHacker to explore what resources are contained within a DLL file.