url mapping in c# asp.net

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IN WEB Config...........>
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<urlMappings enabled="true">

<add url="~/operatorlogin.aspx" mappedUrl="~/adminlogin.aspx?id=op"/>
<add url="~/adminlogin.aspx" mappedUrl="~/adminlogin.aspx"/>
<add url="~/superadmin.aspx" mappedUrl="~/adminlogin.aspx?id=sa"/>
<add url="~/accounts.aspx" mappedUrl="~/adminlogin.aspx?id=ac"/>
</urlMappings>

</system.web>

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