in reply to Passing CGI parameters on new CGI

The first cgi (login.cgi) gets the input from a form as a POST. I want to pass the same arguments to the second cgi (login1.cgi) as a POST again, but I can only do it as a GET (i.e. putting the params on the URL).
That's exactly what I want to avoid (and I don't know how to).
Thanks for the side note. It's valuable and I'll definitely use it.
By the way, excuse my english. It's not my mother language.