On a decently configured machine it is impossible to install anything without the user's consent, and trying to bypass that could be illegal depending on the circumstances - I would consider it immoral in any case. Also, running a certain program will by itself not guarantee a specific user sitting at the keyboard. What's wrong with a simple user/password scheme anyway?

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^3: interaction or verify with users pc by Joost
in thread interaction or verify with users pc by Evilzz

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