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题干：AtanofficeinHampton,Virginia,intheeastoftheUnitedStates,ateamoftennetsavvyworkersscoursthewebforsexualcontent,frombasicsexeducationtosexacts.This“qualityassurance”teamismakingsurethattheblockingcomponentofSymantec’sNortonInternetSecurity2000computerprogramremainseffective.Thisisbecausethereiswidespreadparentalconcernaboutblockingwebsiteswithsexualcontentfromchildren.Websiteblockingisnothingnew—serviceslikeNetNannyandprogramslikeCyberPatrolandGuardDoghavebeenaroundforafewyearsnow,protectingchildrenandreassuringparentsthatonlywholesomewebsitesareaccessedbytheyoungsters.NetNannyandCyberPatrolwillpreventaccesstoanyquestionablesiteswhentheprogramisinplace.NowSymantecsaysithascreatedanewcategoryinconsumersoftwarewithapackagethatcombineswebsiteblockingwitha“firewall”,protectingyourcomputerfromhackersandviruses,aswellaspreventingcarelessdisclosureofpersonaldata.Inshort,NortonInternetSecurity,astheprogramiscalled,isdesignedtoserveastheguardianofyourdigitalhealth,keepingthebadthingsoutandtheprivatethingsin.TheSymantecprogramcanbeconfiguredinmanyways:thewebsiteblocking,forexample,canbesettobeeitherselectivelypermissiveortotalinitsbanningofwebsites,orswitchedoffentirely.Also,Symantec’slistofno-goareas,whichontheCDnowstandataround36,000addressed,isnotconfinedtosexsites.TheteaminVirginiaisalsoonthelookoutforsitesadvocatingdrugs,orwhichcontainreferencestoviolenceorgambling,andkeepsawatchonchatrooms,emailservices,entertainmentportals—evenjobsearchandfinancialpages.Thesesitescanbeblockedbytheprogram.ComputeruserscanalsorefreshtheaddresslistonlinewiththeLiveupdatefeaturewhichisusedbyNortonAnti-Virus(whichisbundledwithNIS)toloadthelatestvirusdefinitions.Thisserviceisfreeforthefirstyearbut,includingvirusdefinitionupdates;itcosts$19.95ayearthereafter.Thesystemisnotperfect,however.Limitedtestingfoundtheblockingofsome“questionable”siteswasnotcomprehensive.Tryingtogetaccesstoawell-knownUSsitesuchasPlayboyresultsinanimmediateblockingmessagewithastandardinvitationtoreportan“incorrectlycategorized”site.Bycontrast,youcouldfindinothercountriessuchasNewZealandasexsitewhichdeclareditselftobe“dedicatedtoprovidingsexualmaterial,imaged,andanythingalittlebitunusualforsexenthusiastsalloverthecountry.”
题目：Norton Internet Security functions to（）.
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