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Your absolutely right. The extended url ?=ect. is being used for tracking purposes. The log files will record that so the site owner can tell how many times a specific ad was clicked on.
The logic behind how this works: if you went to a page blah.htm?=google or blah.htm?=overture, the user would see the same page, blah.htm. But the stats program would know the difference and therefore would generate a report of how many times a user entered from ?=whatever. This way ads can be modified for better ROI.
This is a general overview. Hope it provides the info you were looking for.
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