IIRC, when I tried Portable Apps years ago, there was a way to lock down access to what I have on my USB stick so if I lost it and someone plugged it into their computer, they couldn't easily become me, already logged in to a half-dozen websites as stored on the USB stick.
I couldn't find it with the current release, maybe it's not there, maybe I don't recall it correctly.
Do I need to use a password protected / encrypted USB stick? or is the functionality still in the Portable Apps software?