Level 1, 2, 3 computer support, computer maintenance, computer data (recovery of-); computer data base (leasing access tim to a-); computer hardware (consultancy in the field of-); computer programming; computer rental; computer software (maintenace of-); computer software (updating of-); computer software design; computer systems analysis; consultancy in the field of computer hardware; leasing access time to a computer data base; leasing access time to a computer for the manipulatio of data; maintenance of computer software; recovery of computer data; rental (computer-); rental of computer software; software (rental of computer-); software (updatin of computer-); software design (computer-)