Monitoring Queryplan onmode -Y

Hi all I am trying to monitor the optimizer query plan of a session with onmode -Y sid 1. With onstat -g sql I can see that the session changes the queries frequently. So I assume that each new query of the session will generate a query plan. This is what I want to see. Manuals say that the query plan is written to a file sqlexplain.out.sid. Unfortunatly I cannot find any sqexplain.out file which matches with that sid. Informix Version is IDS 11.50.FC7W3, OS is Solaris for the database server host and Reliant Unix for the remote 4ge application host. The session resides on host A with Informixserver A_tli. User informix on this host started onmode -Y sid 1. The program that started the session runs on host B started from user u1. The pid is found on host B. It is a 4ge program. The user u1 has an account and home-dirs /home/u1 on host A and host B. As I mentioned above: I cannot find a file sqexplain.out or sqexplain.out.sid anywhere. I did following test: User u2 on the same host as the Informixserver. Starts dbaccess session. User informix starts onmode -Y sid_of_dbaccess_session_if_u2 1. Now I found /home/u2/ sqexplain.out.sid_of_dbaccess_session_if_u2. Each sql-Statement of that session where monitored in that file. The same I wanted to achieve for the running 4ge session from that remote host. Any ideas? Reinhard.