Also when you attempt to do an on-line search with AC, a pop-up of permitted areas will probably appear. If a desired area doesn't show up the AC has low probability of success there.
If you are using the MB deposit, anything can be requested. To do an on-going request, do a search either by area or by inputting the codes for the resorts and dates of interest. When nothing positive comes back, a screen asking if you want to place an on-going request will appear.
At the this point follow the on-screen instructions (they are rather obtuse at times). With patience, you will be able to specify resorts and dates of interest. Extra patience will really be needed because the request procedure really isn't set up for requesting "any week in this range except Week X." You will be required to pay the exchange fee when the request is submitted.
Keep in mind that the request is filled with the first date and week available so don't request anything you don't absolutely want. There is a cancellation period of 24 hours starting from the instant II confirms the exchange so it is necessary to check on-line daily to make sure that the exchange that is confirmed is satisfactory. The II e-mail confirming my last exchange arrived three days after the I saw the confirmed exchange on on-line.
Art