Outgoing Interface

Hi,
I have implemented an Outgoing Interface for a COM component in VB. I pass the callback function (implemented in VB) to the component thro' an Advise method.

Through another interface(implemented in C++), to the same component, I call a method Compute(). In this method I start a thread to do a long computation. Once the computation is over, I should call the Callback function in VB. How should I do this?

I tried using the CoMarshalInterThreadInterfaceInStream() method to stream the Callback function. But that returns a failure code!

Can somebody help me?

Thanx,
Jagadish.