Address is desktop software that provides rapid addressing and postcode finding capabilities for private addresses including the locality, post town and county for any postcode; the user adds the house number. Find a postcode from the known parts of the address, entering any combination of parameters to produce a list of postcodes that fit the data. The SDK is available as a DLL, a COM object, a .NET ClassLibrary, Java and PHP. The software includes the official Royal Mail data and the official Ordnance Survey map references for each postcode, accurate to 1 metre. Updates are available four times a year via the Arc en Ciel website. Support is included. Annual renewal is required under Royal Mail licensing conditions. An unlimited licence is available allowing use by an unlimited number of end-users.