I try to answer my self... but I not completly shure above it.
My XAMPP is working ok and I see htdocs from all my intranet by direct IP. This is a good succes for me.
But, What's happend?
1rt - My ADSL router 80 port is not working. (when I declare it in NAT, this works, I don't know exactly how... but I understand this ok)
2nd - The XP SP2 Firewall is not problem because from intranet I can see the XAMPP webserver.
I make other test, from my external web page, I put a link point to my XAMPP server (the same fisical IP) in germanic, present, like "linckprova" and this works ever when i test from my intranet, but not form a external host. For example, I try to linck it from a Magbook in the intranet whith his fisical IP, ... is a workgroup, and also do not see the XAMPP server. however Macbook can see the normal thins of the workgroup like other hardisk ...
I think this is because i need to declare also a domain in DNS services. but why??? ...Why I can not works whith a fisical IP? How can I convert a URL to a fisical IP like in a intranet ? Is this posible?
Somebody sais to me above no-ip server... but this is a good chance?
And also an other important question..
Realy I don't need any think more to ofer my XAMPP server to the comunity ?
Congratulations for your work in servers XAMPP and for this forum
Thank for all