I need to know how works Ishield serial#
mechanizm,and want to know how to reverse it!

Hi Sel,

Why don't you try the following link for starters...
http://www.woodmann.net/fravia/snatch_2.htm

You also might want to do a search for "installshield" on the +fravia search engine. I did a search on this same topic a while ago and there are a number of good essays :-)

Regards,
Clandestiny