NFS read-only file copies

[Larry Carroll]

In Sun's Network Programming Guide, on page 9, it says: "The flexibility
of NFS allows configuration for a variety of cost and performance
trade-offs.  ... In the case of read-only files, copies can be kept on
several servers to avoid bottlenecks."

However, I've spent hours reading the table of contents & the totally
inadequate index & the manual can't find where it tells how to do this.
Ditto results for an examination of the System & Network Admin Manual.

Is the quoted material a bunch of lying hype?  Or can someone point out
the part of the manuals where I can read up on this & implement it?  And
if this ability is real, do very many other vendors have it, such as DEC's
Ultrix?