There is no NS6.9. There is NS6 but then there was the 6.5 console upgrade.
You won't find these documents online as the product has been retired and is not supported. I can online find release notes online.
Perhaps someone on the forum still has NS6 around and could email you a copy of the built-in documentation.
Unless you have a really compelling reason to have an NS6 running you really should be working with SMP 7.1 SP2 instead.