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????VP???Verifacation Point:

????VP1(??????)??????б??г???????????????????????????????????????

????VP2: ?????????????????????磺???user1?????1 user2???????????

???????user1??????飺 user1??????????????????user2???

???????user1????????????user1??user2???????????????????

???????user3????????????user1??????????user2?????

????VP3????????????????????????

????VP4?????????????????????doc??gif??xls??ppt??pdf???????????????С????100k??1M??5M??10M

????VP5????????????gif??tif??jpg??bmp?????????????????????????

????VP6??????????????????????? ??????С???????????????????????