42 TECHNICAL PLANNING, STRUCTURING AND CONSTRUCTING OPEN AND CLOSED DATA NETWORKS, NAMELY, LAN AND WAN; SOFTWARE MAINTENANCE, NAMELY, FAILURE CONSULTATION BY TELEPHONE AND FAILURE ELIMINATION VIA DATA LINE AND ON-SITE FOR OPEN AND CLOSED DATA NETWORKS, NAMELY, LAN AND WAN; TECHNICAL CONSULTATION REGARDING OPEN AND CLOSED DATA COMMUNICATION NETWORKS, PARTICULARLY IN THE FIELD OF SECURITY OF ACCESSES; TECHNICAL CONSULTATION REGARDING SECURITY OF OPEN AND CLOSED DATA NETWORKS, NAMELY, LAN AND WAN, AND DATA TRAFFIC, NAMELY, E-MAIL TRAFFIC; RENTAL OF COMPUTER HARDWARE AND COMPUTER PROGRAMS; DEVELOPMENT OF COMPUTER PROGRAMS AND SOFTWARE MAINTENANCE, NAMELY, FAILURE CONSULTATION BY TELEPHONE AND FAILURE ELIMINATION VIA DATA LINE AND ON-SITE