Find dead Session

Let´s say i have a session that connects to the database without the listener (beq or ipc)
this session has a infinite loop like
begin
loop;
insert into ....
commit;
end loop;
end;
i kill this sql*plus session with the "X" Button, so the transaction still continue.
How can i find this "dead" session?
Any Ideas ?
Thanks in advance
Marco
PS: sqlnet.expire_time only works if you connect through the listener

thanks for the fast reply and ok it´s a theroretical question
but if i have 100 Session with the same username i can´t find it this way.
i tried it with last_call_et in V$session but it dosn´t work also.
Mayby comparing the process id of v$process with the process explorer (sysinternals)
but isn´t there a easy way to find dead sessions ?
Thanks
Marco

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