Table accessed

Is there any way to figure out which tables are accessing in informix ver 7.13 running on hp-unx 10.01 when some user trying to access informix IDS 7.13 from the front end fourgen application.

I am pretty sure that version of Informix has the onstat utility. When a session connects to the database look at the output from onstat -g sql, locate the session id of the connected user and then run onstat -g sql <session id>. If the user is accessing a table it will show up there.