The Vander Elst visa is a type of visa or work permit available to non-EEA/EFTA citizens employed by and working for a company in an EU/EEA/EFTA country, that allows them to work for that company in another EEA/EFTA member state, subject to meeting certain eligibility conditions.Employment (Van der Elst)
The name comes from a legal case where the Belgian entrepreneur Raymond Vander Elst appealed his case to the European Court of Justice and won in 1994.61993J0043 Judgment of the Court of 9 August 1994. - Raymond Vander Elst v Office des Migrations Internationales. - Reference for a preliminary ruling: Tribunal administratif de Châlons-sur-Marne - France. - Freedom to provide services - Nationals of a non-member country. - Case C-43/93. He had won a contract in France, but got bureaucratic trouble with his Moroccan employees.
However, it seems to vary how this is implemented, and often non-EEA-citizens need a normal work visa or work permit when working in another member country regardless of employer.
See also Visa policy of the Schengen Area (but Vander Elst visas apply also to non-Schengen countries in the EU/EEA)
References