42 Preparation of data processing programmes; consultancy in the field of computers; maintenance, design and updating of computer software; configuring computer networks by means of software; maintenance and installation of software; implementation of computer programs on networks; technical project management in the field of electronic data processing; rental of computers and computer software; conversion of computer programs and data, other than physical conversion; technical customer service and advice regarding the operation of ERP software handled via a hotline; all the aforesaid services exclusively in connection with and for the supplementation of ERP software systems.