I would assume that at college you log in under a profile, and that you log out of that profile when you leave college, others sharing the machine would do so under a different profile, that is they would have there own cookies under their profile and not be automatically logged in when they enter p2p as you.

Maybe someone from p2p can confirm this.

PS Do you get picked on at college for asking the lecturer too many unrelated questions? :)hehe...

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They say, best men are moulded out of faults,
And, for the most, become much more the better
For being a little bad.
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