Hello My application use coroutine api to display a message like: "the document is open by another user" if the pdf document is already open by another user. BUT: my problem is that now my web app server is on a linux machine, and my pdf files on a windows 2000 machine, and I want to know if and how can I use coroutine API to verify that a file is open on the windows machine. I've add in my web-inf/lib a jar containing the com.neva classes, but I have an error when I try to read (from a webb page served by my server) a pdf which is already opend on the windows machine: E SRVE0026E [Servlet Erro] [can't find librairy COROJDK11 (libCOROJDK11.so) in java library path] I have in my windows machine a corojdk11.dll thanks for help