Restricting the Oracle user from Login

Hi,
I want to restrict the users from login depending on two parameters usind Database logon trigger,
i.e
1. MODULE (like SQL*Plus...)
2. USERNAME
I can get USERNAME from
select SYS_CONTEXT('USERENV','CURRENT_USER') from dual
But, select SYS_CONTEXT('USERENV','MODULE') from dual says invalid parameter.
Can anybody help me?
Ronald.

Both are working fine i saw
SQL> select SYS_CONTEXT('USERENV','CURRENT_USER') from dual
2 ;
SYS_CONTEXT('USERENV','CURRENT_USER')
APPS
SQL> select SYS_CONTEXT('USERENV','MODULE') from dual ;
SYS_CONTEXT('USERENV','MODULE')
SQL*Plus

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