Example: assume you want Christmas week, Dec 25-Jan 1. On Jan 19 you reserve Dec 19 to 26 resulting in your getting the first night, Dec 25, that you actually want. Next day, Jan 20, you call MS and drop Dec 19 and add night of Dec 26 so departure date is Dec 27; then next day you call and drop Jan 20 and add night of Dec 27, etc., until you have "walked" to the reservation you want.
You probably do not necessarily need to call daily. It is designed for you to beat those who wait until Jan 25 to make that same reservation you want. It is obviously limited to number of points you have, e.g., if not enough to do 7 nights you would start walking a little later. Also, it does not necessarily work at 7 months out because the resort owners could have already booked nights you want toward end of your trip via the 11 month window.
Moreover, it is usually not needed. However, for AKV concierge it is something to consider much of the year at 11 months out, and for some other things like AKV value, OKW GVs at Hospitality House area, BWV GVs, BWV standard, BLT standard, and possibly VGF studios, it is something to consider at least for reserving time during the three highest
DVC demand weeks of the year: first and second week of Dec and Christmas through NYE.