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If the IdentitySection.Impersonate property is set to true, each request is served by a Web application impersonating its client. That is, either the user currently logged on or the user specified by the IdentitySection.UserName and IdentitySection.Password properties. When the IdentitySection.Impersonate property is set to false, the application does not impersonate any client user.
For security reasons, the identity section supports storage of the encrypted IdentitySection.UserName and IdentitySection.Password.