How to use Oracle logon trigger to stop login from Particular program

Here is the Oracle logon trigger  which can be used to stop login from particular program and user

CREATE OR REPLACE TRIGGER program_restrict
AFTER LOGON ON DATABASE
BEGIN
FOR x IN (SELECT username, program
FROM SYS.v_$session
WHERE audsid = USERENV (‘sessionid’))
LOOP
IF LTRIM (RTRIM (x.username)) = ‘TEST’
AND LTRIM (RTRIM (x.program)) IN (‘sqlplusw.exe’,‘TOAD.exe’)
THEN
raise_application_error
(-20999,‘Not authorized to use in the Production
environment!’);
END IF;
END LOOP;
END program_restrict
/