monitoring the mouse movements in banner ads

While reading an article in slashdot, I came to an advertisement by http://www.mediaplex.com. What hold my attraction was that as i moved my mouse over the ad box, the mouse co-ordinates were monitored.
The url of the link included the variables for storing the mouse postion. Very innovative to find the portion of the ad which attracted the visitors attention.
The link is
http://altfarm.mediaplex.com/ad/ck/xxxx-xxxxx-xxxx-x?mpt=%5BCACHEBUSTER%5D&mpvc=?a,b
where a,b are the co-ordinates of the mouse.
But what is the [CACHEBUSTER] …

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