how to Totally Hide a folder from view

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May somebody please tell me how does a program "folder lock" works ?How does it totally hide the folder from our view ?download url --- http://www.badongo.com/file/9414077

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Let me explain why I said it it totally disappear from our view.

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1. if you already hide the folder,when cannot found it even already view hidden file and system hidden in the folder option.

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2. if you already hide the folder,disappear at all from command prompt even using dir/a.

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3. if you put the folder u want to hide in another folder,for example, put the folder 'hidethis' in 'testdir',the folder 'hidethis' must have some file inside (which contribute file size),now view the size of 'testdir', example it show 300kb,after we hide the folder 'hidethis',we view the si ...