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Roles can be external, internal, or both. An external role shows up as an option in the Role drop down list on the search criteria and on the Position Info page. An internal role shows up as an option for the Admin Users page. User interface sections are displayed or hidden depending on the role a user has. There are currently no roles that are both external and internal but a user , such as myself can have multiple roles, i.e both an internal role of SYS-DEV and an external role of ITS BIG-MGR.
Admin user roles dictate what options are available to on the admin menu under Administrative Functions. See table above for more information.