Single-window system Single-window system The single-window system is a trade facilitation idea. As such, the implementation of a single window system enables international (cross-border) traders to submit regulatory documents at a single location and/or single entity. Such documents are typically customs declarations, applications for import/export permits, and other supporting documents such as certificates of origin and trading invoices. The main value proposition for having a single window for a country or economy is to increase the efficiency through time and cost savings for traders in their dealings with government authorities for obtaining the relevant clearance and permit(s) for moving cargoes across national
Single combat single combat could also take place within a larger battle. Both ancient and medieval warfare did not always rely on the line or phalanx formation. The "Iliad" notably describes the battles of the Trojan war as a series of single encounters on the field, and the medieval code of chivalry, partly inspired by this, encouraged the single combat between individual knights on the battlefield, in which the loser was not usually killed but taken captive for ransom. This tradition ended in the 14th century due to the use of the longbow and the pike square against mounted knights (Battle of