The Schengen agreement took effect on March 26, 1995. This agreement eliminates ail border checks on the common borders between the 15 countries signatories of the said agreement. This replaces them with checks at theses countries outermost borders.
The treaty bears only on the movement of persons and not on their settlement in one of the member states or on security checks.
If you are arriving from a non-Schengen country in one of the 15 countries and if you are not a citizen of a European Union country, you must:
When you are covered by one of the standard visas listed above (common to all Schengen states) and wish to travel among the Schengen countries, you must prior to entry in other country fill in a mandatory declaration of entry into the territory check with the appropriate authorities on arrival to find out the formalities required.