What contents is contained in ndisrd.sys driver source code

If I want to order ndisrd.sys driver source code, pls tell me what contents or components is contained in its source code base?

It contains the complete source code for the NDIS hooking and IM drivers.

For windows x64 OS, why not continue to adopt NDIS-hooking technology, but official IM driver scheme for ndisrd.sys?

Windows XP/2003 x64 introduced PatchGuard technology which protects NDIS.SYS export table from modifications (if PatchGuard finds that NDIS.SYS was modified then it crashes the system). This is also true for Vista/2008 x64. Preventing PatchGuard from doing is job is possible but requires kernel modifications and these modifications are different for different kernel builds because MS updates PatchGuard each time when they got informed there is a way to workaround the current implementation.

I search winpkfilter over google and find that an Austria-based company DeskSoft(http://www.desksoft.com) builds its product BWMeter upon WinpkFilter, is it true? Can u confirms that if u don’t mind?

Yes, it is true.