TMS320F28375D: Endpoint0 support and vendor commands

Part Number: TMS320F28375D

Tool/software:

Hi,  I have developed several boards based on the TMS32F28375D.  I would like to use vendor commands to communicated with endpoint0  The host side of the software is mature and I would like to make these new boards compatible with existing Windows software..  It seems that the basics for vendor commands exist in the C2000 USB library, but I have found no examples and sparse description in the documentation.  Section 2.37.2 describes using pfnRequestHandler, which is what I think I need.  Do I connect  the Request Handler through a bluffer like the endpoint handlers?  I haven't found any indication that the endpoint 0 buffer is already created with a request handler.  If it already exists, how do I link to it?