Sending POST data without a form

[thepeccavi]

Does anyone know of an EASY way of sending POST data from one domains to another without a form using php?

You see, I want to move session data (sensitive) reasonably securely (ie. not in the URLs) to a different domain where it will be used and returned to the old domain. Because of various security restritions, domains (in this case, it is actually between blah.domain.co.uk and domain.co.uk) cannot pass $SESSION data between them... Fair enough, so is there a way of me sending data to a PHP script on another domain that then logs you into that domain using the data supplied in $POST?

I have found several which make my eyes pop out which involve really odd code, so does anyone know of anything simpler. And if not, can someone explain how to use some of these scripts?

Thanks!

[DeadlySin3]

Perhaps saving the session data into an sql database that both domains can access may work. Maybe i'm just tired but that's all I can think of right now.

[PlaGuE]

you could use cookies.
http://ca.php.net/manual/en/function.setcookie.php

setcookie("TestCookie", $value, time()+3600, "/~rasmus/", ".example.com", 1);

?? I've never done much with cookies as of late tho.