# SSO IFrame Help

The following preferences can be used with the SSO IFrame Portlet in addition to the standard IFrame preferences

Preference | Usage
--- | ---
sso.type | The type of Single signon authentication. Valid values: form | basic | basic.preemptive | url | url.base64
sso.url.Credential | The name of the credential input field or parameter
sso.url.Principal | The name of the user name input field or parameter
SSO Principal | The actual user name
SSO Credential | The actual crendential value