When you work in Norway, you automatically become a member of the Norwegian National Insurance Scheme from your first day of act. You will not become a member though, if you are working temporarily for your foreign employer in Norway.
Membership of the National Insurance Scheme is the key to your rights from NAV. You can read more about membership in the menue to the right.
What rights they are able to demand for the purposes of the National Insurance Act depends on what kind of membership you have, or whether you are covered by a social security systems agreement.
You should be borne in mind that some rights require that you have been a member of the National Insurance Scheme for a certain time. For questions about the wide range of benefits and requirements pertaining to specific countries/ national guarantee agreements