http://oabrmls.rets.fnismls.com:80/rets/fnisrets.aspx/OABRMLS/login?rets-version=rets/1.5
http://oabrmls.rets.fnismls.com:80/rets/fnisrets.aspx/OABRMLS/search?SearchType=OpenHouse&Class=RS_1&Query=%28L_Status%3D%7C1_0%2C1_1%2C1_2%2C1_3%2C1_4%2C1_5%29%2C%28OH_StartDate%3D2012-02-03%2B%29&QueryType=DMQL2&Count=1&Format=COMPACT-DECODED&Limit=none&StandardNames=0
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Just downloaded 178 open houses from RETS.