send packet thru NDISWAN

hello all
I use protocol driver to send packet to Ethernet adapter…Its works
fine, but when i do it with WAN adapter i have problem (on windows nt)
I register my protocol and then open WAN adapter (on win 2000
NDISWANIP,on windows nt 4.0 - NDISWANxx)…
So how can i do it?
Thanks