| ChangeAnyProc | Not used | 
| ClearAnyProc | Procedure called to clear a variant | 
| EmptyParam | Empty parameter variant | 
| InvalidCustomVariantType | Handler for invalid custom variants | 
| NullAsStringValue | String value to use when converting a Null to a string. | 
| NullEqualityRule | Variable describing what to do when checking for equality of Null values | 
| NullMagnitudeRule | Variable describing what to do when checking for order of Null values | 
| NullStrictConvert | What to do when converting Null to another type | 
| OleVariantInt64AsDouble | How to convert Int64 variants | 
| PackVarCreation | Size to use when creating an array of integers | 
| RefAnyProc | Handler called to obtain a reference to a varAny typed variant | 
| VarDispProc | Handler called by DispInvoke |