It is that configuring-an-account part that makes it so tricky. One example is RKWard, a very handy R GUI, but it took me forever to get it working. I tried it under the guest account, but it turns out to crash again as it used to do under my own account. Should have been more careful....
I'm still hoping to find a "good enough for me" solution, comparable t the master-password in firefox
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