Did Oracle EBS has a feature to sent an email at the pre-registered email address if his or her account is locked ?
Does oracle EBS application prevent information disclosure about account lockout status sent to the user via the application interface ?
You said: "Did Oracle EBS has a feature to sent an email at the pre-registered email address ". Do you mean workflow notification mailer?
The EBS is managed using apps user. If apps user is locked then the whole EBS would be down.