This method is used to arrange a FIFO (first-in, first out) When selected, then take a look at the references a bit. If the referenced bits. There is a "0", it will replace this page. If bit 1 is referred to as "values" we will give a chance to this page again by editing this page reference bits as "0" and a edited time arrives (this time is brought into memory) as the current time and then check for the next page. In a FIFO will see that this page (and thus get the opportunity again) is not selected, shuffle off until all other screens will be relay off (or get the opportunity again.) Best pages are referenced frequently referenced bit is correct as "1" over and over until it could not be selected.
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