I havent used UDP protocol much, but heres what I usually do:

I believe with UDP protocol, you must bind the winsocks to each other--but anyways after you have sent the first data from w1 to w2, tell the w2 on data arrival, w2.senddata strTest-- then on the w1 data arrival, w1.getdata strTest2. Just put a msgbox or something to display the string test2. If this is confusing, Ill make it clearer, or just pm me.