Interface needed to get VCL object within methods in which its IDispatch interface passed.

IQueryPersistent = interface

Internally used to work with properties (which are objects) of VCL objects within script environment.

This interface is implemented and used internally, you don't need to obviously implement or use it in your source code.

Returns VCL object represented by IQueryPersistent.

function GetPersistent: TPersistent;

This method is implemented and used internally, you don't need to obviously implement or use it in your source code.