How to send private SRBs to port driver in windows 9x?

Hello,

Can anybody help me, how to send private SRBs from Vendor Supplied Driver (VSD) to Port driver (ESDI_506.PDR) in windows 9x.

I have gone throgh the sample (HelpVsd) provided in windows 9x DDK. But unable to make it work properly. It would be a great help if any one give direction.

Thank you,
Bala