If he does not use a Router then he does Not have a Local Network (LAN).
Regardless of every thing else, it is highly dangerous to do so. It means
that his so called Networked computers is the Internet at large and it is
Highly Not secured.
First step he need to get a Router and establish Local network LAN.
Win 7 when configured on peer-to-peer Network, Win 7 has three types of
Home Network = Works only between Win 7 computers. This type of
configuration makes it very easy to Entry Level Users to start Network
Work Network = Basically similar to the previous methods of sharing that let
you control what, how, and to whom folders would be shared with.
Public Sharing = Public Network (like Internet cafe) to reduce security
The Work Network is the one that most of us are going (and need) to use.
Win7 Work Network's Sharing settings are in principle similar to Vista's
configuration, some menus locations in Win 7 might be in different place,
and look a little different, but it should not be a problem to adapt.
Make sure that the Software Firewall on each computer allows free local
traffic. If you use 3rd party Firewall On, Vista/XP Native Firewall should
be Off, and the active Firewall has to adjusted to your Network IP numbers
on what is some time called the Trusted Zone (consult your 3rd Party
General example, http://www.ezlan.net/faq#trusted
Win 7 -
Win7 Work Network with a little visual help),
Vista File and Printer Sharing-
Windows XP File Sharing -
Printer Sharing XP -
Windows Native Firewall setting for Sharing XP -
Windows XP patch for Sharing with Vista (Not need for XP-SP3) -
Sharing between PC and Mac -
When finished with the setting of the system it is advisable to Reboot all
the hardware including Router and all computers involved.
Jack (MS, MVP-Networking).