Hi HSC, I was trying to avoid changing the application, but I think webutil/trigger this is the only solution. Toon, from gv$session, "MACHINE" is populated with the Forms server hostname and "TERMINAL" is null, then, unfortunately it is not possible to block that way. Thank you for your suggestions. Regards -- Ivan Ricardo Schuster OCP 10g/11g OCE RAC 10g/Linux -- //www.freelists.org/webpage/oracle-l