HPUX -- Network Install

I have a HP box (PA RISC) rp3440.
The machine does not have a CD-ROM.

I need to re-install the OS.
Basically a network install...

How did I do a network install?

Anybody know of a document for Network Installs for a HPUX 11.23?

look at from p 90:
http://docs.hp.com/en/5187-2239/5187-2239.pdf