+1 But less jokingly, do you have a smartphone? Some brokers have apps that you can use to place trades via your phone. Unless you also shares your smart phone with your kids...
thanks everyone for your replies the scenario isn't one I have to live with, the closest I've come is a neighbor who had grandchildren that repeatedly fu her computer including downloading viruses otherwise I've no experience with kids and computers I was asking my question for a project I'm working on, sort of covering the bases if for whatever reason even a very cheap second computer wasn't a possibility but based on what you've said, I think TrueCrypt with a partition would do the job wouldn't it ?