| SG Window | Window Object |
| WLIndex Constants |
| Reference Events Constants Error Codes |
| Constant | Hexadecimal Value | Decimal Value |
| gwl_WNDPROC | &HFFFFFFFC& | -4 |
| gwl_HINSTANCE | &HFFFFFFFA& | -6 |
| gwl_HWNDPARENT | &HFFFFFFF8& | -8 |
| gwl_STYLE | &HFFFFFFF0& | -16 |
| gwl_EXSTYLE | &HFFFFFFEC& | -20 |
| gwl_USERDATA | &HFFFFFFEB& | -21 |
| gwl_ID | &HFFFFFFF4& | -12 |
| dwl_DLGPROC | &H00000004& | 4 |
| dwl_MSGRESULT | &H00000000& | 0 |
| dwl_USER | &H00000008& | 8 |
For a detailed explanation of index values please consult Win32 SDK.