Business information services and appraisals; Computer consultation; Computer consultation in the field of computer security; Computer hardware development; Computer installation and repair; Computer network design for others; Computer programming for others; Management and compilation of computerized databases; Management of telephone call centers for others; Operation and administration of telecommunication systems and networks for others; Operation of telephone call centers for others; Repair or maintenance of computers; Repair or maintenance of measuring and testing machines and instruments; Secretarial and clerical services; Security guard services; Security guarding for facilities; Security inspection services for others; Technical support services, namely, troubleshooting of computer hardware and software problems; Technical support, namely, providing back-up computer programs and facilities; Testing, analysis and evaluation of the goods and services of others for the purpose of certification