>Who can tell me where to find the doc of xp_reg???? and xp_oa????


xp_reg*: http://www.mssqlcity.com/Articles/Undoc/UndocExtSP.htm
sp_OA* : BOL or MSDN online at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tsqlref/ts_sp_oa-oz_9k2t.asp