PHP as a File Proxy between the internet and a LAN computer - a possibility?

As a first-timer on this newsgroup I beg for understanding for any stupidity I may write. :) Hi, State of affairs: A LAN with a computer that is not directly accessible from the internet. The LAN is connected through a gateway to the Internet - and the LAN has only one IP, so only the gateway is really accessible directly, from the outside. The owner of the LAN computer (Windows XP) can map a drive to a designated directory on the gateway computer, and use it as if it were a local drive (when it comes to file manipulation). The server is PHP capable and the phpinfo() can be seen here: http://www.stuwo.at/~adilovici/index2.php . What I want: The "designated" directory is indeed the one ~adilovici, and the webspace is 80MB. The problem is that - when I am away for a long time, I might need access to certain files on my LAN computer, and I am not able to that in a simple way (or am I?!?) Any method for doing that would suffice - and I was thinking of doing a PHP interface on my website that would somehow tunnel me the files on my own computer (in this scenario I am coming from the internet, to the LAN gateway which is to forward me/be a tunnel to my LAN computer somehow). The server is a linux machine - what phpinfo() says is all I have - I don't have shell access to the server. Perhaps perl and cgi are a possibility, but I don't know cgi or perl (which is not a problem if anyone suggests I should be able to solve the problem with them, assuming the server will allow me to use them, but PHP is at stake in this post)... It is not a problem to set up a Linux computer instead of Windows XP, but if the same thing is possible with XP, then XP preferred. I hope I was clear enough about what the problem is. Perhaps a completely PHP-irrelevant solutions exist, such ideas are also welcome. -- Irfy