MFC program: How do I figure out what object an InvokeHelper is calling?

So, I've inherited an MFC application compiled with VS2008, none of the original authors are around.  I've forgotten a lot about COM and MFC, but I have to reverse engineer it and make some modifications.  Some of the functionality is seems to be executed via InvokeHelper calls.  Such as the one below.  

I think this accesses a COM object, correct?   So somewhere somehow the application must be pointed at this object, maybe with a complementary call?  Or a reference?  Can someone tell me where in an MFC program I can figure out what COM object this is calling?

Thanks, I think if someone answers this specific question then maybe the rest of it will come back to me.  :)

(And please, I appreciate all answers but don't point me towards general doc on COM interop, I'm sure that would take me hours to pore through, and I'm looking for a quick answer to this specific question.  Thanks.)

void CLsDisplay::StartAnimation(double dAngleRangeDeg, long nFrames, long nSeconds)
{
	static BYTE parms[] =VTS_R8 VTS_I4 VTS_I4;
	InvokeHelper(0x9, DISPATCH_METHOD, VT_EMPTY, NULL, parms, dAngleRangeDeg, nFrames, nSeconds);
}

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