Session across Multiple Hosts

Dear all, I was wondering, can session variables be transfered across multiple hosts, i.e. if I send a request from http://host1/page1.phtml, to http://host2/page1.phtml where I started the session by SessionRegister() or some other way and I gave the variable VAR1 some value, then I went back with header("Location: http://host1/page2.phtml"), does the VAR1 still hold the value? if not, please advice with the way I can do this (transfere database results from one host to another without remote access). Best Regards Hayan