42 Computer programming, namely, the design, development, processing, maintenance and updating of computer software, software for mobile devices, and software interfaces and applications all for optimising the performance of computer and mobile operating systems, by creating hierarchies which control access to programs, files and data, and remove such programs, files, data and remnants thereof; rental of computer software, software interfaces and applications, and applications for mobile devices, all for optimising the performance of computer and mobile operating systems by creating hierarchies which control access to programs, files and data, and remove such programs, files, data and remnants thereof; design, development, creation, maintenance and updating of software for electronic databases for the tracing of programs, files, data and remnants thereof; rental, of software for electronic databases, for the tracing of programs, files, data and remnants thereof; technical writing in the nature of preparing of technical manuals for the maintenance and optimisation of computer and mobile operating systems; design, modification, development and implementation of programs and applications for uninstallation, applications for mobile devices, tools and platforms for computer and mobile operating systems