With plain OpenACS 3.2.x, ForceHostP on (or true or 1 or whatever),
just add www.site1.com, site1.com, www.site2.com, site2.com to your
DNS all pointing to the same address.
A request for www.site2.com/whatever/whoever.adp will be redirected
to www.site1.com/whatever/whoever.adp. This solves the cookie issue
because your www.site1.com cookies will be used regardless of
whether they type in or link to www.site1.com or www.site2.com.
The drawback is that their address bar will always show
www.site1.com. For many sites this isn't a big deal.
