POST file transferring

Hi guys! The situation is following: I need to transfer a file from one server to another by POST method. Goal server has a getfile.php script that actually is placing the file in temp directory for further opening and reading using fopen(..) the thing i cannot get into is how to send from one php script (without any forms) to another a file and get this filename and the file itself out of some POST variables in getfile.php could somebody explain me this? Thanks P.S. I saw some partially and poor documented info about using curl, but the whole picture didnt come clear!