Help Needed from techies

I am working on a project and in concern to that i came across a good software by the name Clean Slate ,this program makes your HDD 100% secure ,

another one is deep freeze url:: http://www.deepfreezeusa.com/

url :: http://www.fortres.com/products/cleanslate_faq.htm

I read the working which they have mentioned

How does Clean Slate work?
Clean Slate actually prevents the original files from being modified. It stores all the changes in a special area that is hidden and protected from users. When the computer is rebooted or a user logs off, Clean Slate merely erases the cached changes and returns the computer to its original configuration


but i was not satisfied

can any one give me a detailed view of what is happening behing the program and how actually they are protecting the pc

it is urgent

HELP !!!! HELP !!!!!! HELP !!!!!!! SOS

just don´t cross-post and read the forum rules. you won´t get help like that...