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Most security packages have settings which can pretty much stop most if not all pop ups. Several companies have found a somewhat nasty way to circumvent pop up blockers by including the data contained in a pop up directly inside of the actual page that a user will open and view. This is why many decent programs also block images inside of pages which effectively will block these types of pop ups. So to circumvent these blockers, many companies now save the pop up files as .tiff or sometimes a .jpg or other file type that is closest to a text file. Which is why many times you may notice what appears to be a pop up in a page you open, displayed even if you have the best security and pop up blocker running on your system. If you try this on a network without permission, and the company did not authorize this, there's a good chance that the administrator many reprimand the responsible individual or worse.
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