When people pass on your Viral Free ebooks, how can we tel how many times the pdf is being opened(viewed)? - not Downloaded from a site, but opened some sort of counter enbedded in the ebook? (I dont mean how can we count the amount of times a PDF is 'downloaded' from a server,- or how many times the pdf has been downloaded from a webpage,) but how many times a pdf has been 'opened' /viewed Some sort of image counter/when the image is loaded live from wherever it is hosted, it shows as a count ? ie- if the ebook is opened 8 times- in 8 separate IP addresses, the image will be shown 8 times, showing that the ebook has been viewed 8 times. That sort of service/system. ? or any other system? /recommendations ? NB How can Google anylitics do this? - Can you give a Step by Step guide on how to do it - what section to click on, what project to open, and Where to place the code