By 'Taking exam offline' what I meant was, I used to connect to internet, go to that particular applet's link, load the applet and disconnect the internet line and take the exam. Since all the code is loaded into memory, we can take and get the results without reconnecting to internet again. Sorry for the miscommunication!
What I used to do was just load the applet in more than 2 windows and disconnect the line so that, in case by mistake I would have closed one window , I start take the exam from another window's applet.
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maha anna