VBScript vs. JScript QueryInterface behavior

[Robert Cram]

We have an ASP application that exhibited some different behavior, when
scripted with VBScript and with JavaScript. Our scripts create a top-level
parent object, then obtain a child object from it, through a call to a
method on the parent. The child object is an ATL aggregate; the interface
obtained from the parent is NOT on the controlling object, but on the
controlled part of the aggregate. All of the interfaces are derived from
IDispatch.

The text at the end of this message is excerpted from a log file. It
documents calls to the CComObjectRootEx<BlahBlah>::OuterQueryInterface
function on the controlled part of the aggregate.

Both fragments are created during the script's call to get the subordinate
object from the parent object. The JavaScript call does some harmless
stuff, then QI's for IDispatch. This immediately navigates the interface
owned by the script from the controlled part (which was returned by the
ActiveX) back to the controlling part of the aggregate. The VBScript call
doesn't QI for IDispatch, and the interface owned by the script remains the
controlled part of the aggregate.

Questions:
Is it a bug in VBScript or JavaScript, that one does this and the other
doesn't?
Is this a failure of our aggregate object to live up to some part the rules
of COM? of Scripting?
Can anyone tell me what the mystery interfaces are? I can't track them
down.

We'll redesign or reimplement to work around the problem, but this was a bit
surprising, and I'd appreciate any information about this.

Thanks,

Bob Cram
rc...@siebel.com

START JAVASCRIPT
In ChildChild:OuterQueryInterface::Interface
{719C3050-F9D3-11CF-A493-00400523A8A0}
In ChildChild:OuterQueryInterface::Interface
{A6EF9860-C720-11D0-9337-00A0C90DCAA9}
In ChildChild:OuterQueryInterface::Interface
{A0AAC450-A77B-11CF-91D0-00AA00C14A7C}
In ChildChild:OuterQueryInterface::IID_IDispatch
END JAVASCRIPT

START VBSCRIPT
In ChildChild:OuterQueryInterface::Interface
{A6EF9860-C720-11D0-9337-00A0C90DCAA9}
In ChildChild:OuterQueryInterface::Interface
{A6EF9860-C720-11D0-9337-00A0C90DCAA9}
END VBSCRIPT