Computer hardware; computer software for the detection, blocking, filtering and modification of unsolicited, bulk, and junk electronic messages; computer software for data integrity and security; malicious code and malicious content screening software; computer security software; computer hardware and software for monitoring, filtering and modifying messages, files, programs and data retrieved or received from computer and communication networks; firewall hardware and software; computer software for network security, network management, protection and recovery from computer viruses, copy protection, transferring data between portable computer devices and desktop and networked computers, and for linking text records with electronic images; computer utility and antivirus software; computer software for use with electronic mail, local area network, internal corporate network, file and proxy servers and structural parts and fittings for all the aforesaid computer hardware