Hi again !
After some tests , I saw that the problem seems to come from my Apache Configuration.
In fact, when i ask PHP to launch OpenOffice with the command exec(), it is doing it.
Whatever I am using PHP4 or PHP5 ( With the Wamp Server you cand find here :
http://www.wampserver.com ) , the results are the sames.
Process "sOffice.bin" and "sOffice.exe" are launched and my WebPage keeps as blocked as them ( It is for running a convert-macro of openOffice wich runs fine when OO is launched in local )
In the same time, if I try to kill Apache, it becomes only possible if I have killed "sOffice.exe" and "sOffice.bin" before...
Well, I have to try again with easyPHP and to see if the difference is really coming from WAMP' Apache. I would prefer to solve this, because WAMP uses PHP5 and I need it to perform a good job with XML without have to use a lot of externals modules...
Let me know if someone has an idea, please and Have a good night !