Characteristics of operating systems including: Command Line Interface (CLI), Graphical User Interface (GUI), dialogue based and gesture based interface

Components of user documentation including: purpose of the system, limitations of the system, hardware and software requirements, how to load/ run/install software, how to save a file, how to print data, how to add records, how to delete/edit records, input format, output format, sample runs, error messages, error handling, troubleshooting guide/helpline, frequently asked questions, glossary of terms

Applications software provides the services that the user requires to solve a task