calling/running a .jar from inside php

Hi, I use iText to split and join pdf files. I have this on my WinXP laptop and get php to build a .bat file - which works fine. I also have iText on my linux server and can call that from within my php script by doing: $x = shell_exec("java -cp itext.jar com.lowagie.tools.concat_pdf blah blah); I now need to do something similar on my NT4-IIS4 server but exec() and shell_exec() do not work on NT. Is there another way to call/run the iText jar file on NT4? Cheers George, in Oxford