42 Installation, maintenance, and repair of computer software and database systems; computer network administration services for others; computer system administration services for others; database administration services for others; computer services in the nature of helpdesk consultation services to assist computer users in solving operating problems via telephone, e-mail, postings in global computer networks, and in person; consultation services to assist computer users in operating and solving problems with computer databases via telephone, e-mail, postings in global computer networks, and in person; consultation services to assist computer users in operating and solving problems with computer databases via telephone, e-mail, postings in global computer networks, and in person; firewall services desktop computer support services, namely, technical assistance for hardware and software problems via telephone, e-mail, postings in global computer networks, and in person; and hosting the web sites of others on a computer server for a global computer network; and co-location services, namely, the leasing of facilities for computers