something I found that might help GDI hackers

[Jonathan Wilson]

struct GDIHandleBitFields {
    unsigned long Index:0:10;
    unsigned long Type:10:5;
    unsigned long AltType:15:2;
    unsigned long Stock:17:1;
    unsigned long Unique:18:8;
};

This might help people trying to understand the inner workings of GDI...
Its current as of windows XP SP1.