GLOSSARY OF TERMS Ó UNCTAD - SITE (V1.15) D.12 Syntax The language in ASYCUDA++ in which Taxation Rules are written. See also  ‘SCTL’. T1 The document used for International Transit movements, based on the  SAD. Technical Advisor An external advisor within the  National Project Team to advise on Technical issues related to the implementation of ASYCUDA++ and the programme of reforms and Trade Facilitation. TIR Carnet A Guaranteed Simplified Document issued by the International Road Haulage Union (IRU) for the movement of goods from the country of origin to another country or countries by approved TIR road transport where the intention is for the goods to be Customs declared at the final point of destination. This procedure can only be used by approved signatories to the TIR convention who have been further approved by the IRU as having sufficient guarantees to allow TIR carnets to be issued. Transit Shed A Customs approved place where goods can be placed under Customs control after arrival but before Customs clearance without any Customs declarations having been presented. Universal Power Supply (UPS) An electrical back up system for computers that will allow the orderly closure of a computer if the mains electrical supply fails. Can take the form of battery back up with individual UPS equipment that is constantly charged while mains power is available or generator powered systems that kick in as soon as mains power is lost. UNIX The ASYCUDA++ Server operating system. Variable A word or phrase used in Taxation Rules to define a particular piece of information to be used in the calculation of the Taxation in the Rule. Visual Display Unit (VDU) The Screen used by a computer – see also ‘Monitor’. Warehouse A Customs approved premises where goods may be stored without payment of Duties or taxes after a Customs Import Declaration for an approved warehousing Procedure has been submitted and processed. Wide Area Network (WAN) The connection of a number of computers in a large network, for example, covering a region or the whole country. This allows the computers to communicate with each other and to share information with the server(s).