A U.S. visa does not authorize entry into the United States or a stay in a particular status, but only serves as a preliminary permission to travel to the United States and to seek admission at a port of entry. The final admission to the United States is made at the port of entry by a U.S. Customs and Border Protection (CBP) officer. For those entering in a nonimmigrant visa status, the admission details are recorded by the CBP officer on a Form I-94 (or Form I-94W for nationals of the Visa Waiver Program countries for short visits), which serves as the official document authorizing the stay in the United States in a particular status and for a particular period of time. In order to immigrate, one should either have an immigrant visa or have a dual intent visa, which is one that is compatible with making a concurrent application for nonimmigrant and immigrant status.