preseed question

["Bjorn Meyer" <bjorn.m.meyer@gmail.com>]

I have two questions.

I am wondering if I am able to specify a location on an NFS share for the preseed file during the netboot? I've notice only url and file are specified in the docs.
Also I am wondering if there is a way in the preseed file to do the client install from an NFS share?

My goal is to just use NFS as apposed to installing a WEB server to use the local mirror.

Thanks in advance.
Bjorn