Pls explain the following terms

[Gopinath]

Pls explain the following terms
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HTTP_User_Agent
Http_Referer
HasKeys
Response.PICS
Response.AddHeader
Session.CodePage
Session.LCID

Difference between the following Three
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Server.Execute
Server.Transfer
Response.Redirect

[rdoekes]

http://www.devguru.com/Technologies/asp/quickref/asp_intro.html