关于POS操作的一些文章收集链接：
http://community.csdn.net/Expert/topic/3852/3852796.xml?temp=.4849207
http://community.csdn.net/Expert/topic/3549/3549152.xml?temp=.1776087
http://community.csdn.net/Expert/topic/3690/3690926.xml?temp=.9588739
http://www.pdriver.com/display.asp?key_id=1356
http://community.csdn.net/Expert/topic/3621/3621131.xml?temp=.5287439
http://community.csdn.net/Expert/topic/3551/3551658.xml?temp=.8640711
http://community.csdn.net/Expert/FAQ/FAQ_Index.asp?id=191843
http://community.csdn.net/Expert/FAQ/FAQ_Index.asp?id=417
http://community.csdn.net/Expert/topic/3615/3615978.xml?temp=.9870264
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