"In Win XP, there is no obvious and easy way."
Actually there is - That's what your HOSTS file is there for (not strictly speaking, but you can use it for that).
Rather than me explaining, pop over to
http://accs-net.com/hosts/ and read all about it. It ain't difficult and doesn't cost anything.
Use your HOSTS file (which is built into Windows [and Linux]) in combination with eDexter and/or DNSKong and Hostsman from abelhadigital -
http://pwp.netcabo.pt/0413933601/abe.../hostsman.html - and you're all set.
And it's all free
