The main core of SIGLE consists of a series of commands executed within AutoCAD. The corresponding programs are written in 'C', which in fact are no more than an 'extension' of AutoCAD. This means that they adhere to the language and the standard operations of AutoCAD. 2D blocks insertion with English and Metric measurements. The interface have add, erase and move facilities. Attribute blocks and extended Data, Works surfaces calculation by Sector.