http - How to put ads on every web page? -

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i wondering how put ads software hotspot shield does. puts ads on top of every web page. don't want in specific language vb or c++ want how in language.

examples:

beside obvious evilness of this, solution quite simple : install transparent http proxy on machine , decorate each , every page html code required display add.

did kind of behaviour bad ? indeed defaces web pages, sole purpose of displaying adds clicked.


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