the lock feature is not thought to stop people from reading your history.
in facts, if you move the history on another &RQ, you can read it as well.
the lock feature is thought to block &RQ while online, so you don't need to logoff.
Someone asked me for a lock-on-start feature, so i made it, but as you can read, it won't stop anyone skilled.
For protecting history and so on i planned another system, and it is already implemented for an half.
It will let you select a second password (if you are lazy you can select the same one) and encrypt history and will be used for lock as well.