functionalityfunc·tion·al·i·ty /ˌfʌŋkʃəˈnæləti/ noun (plural functionalities) [countableC, uncountableU]computing one or all of the operations that a computer, software program, or piece of equipment is able to performThe module provides the functionality needed to run a Unix client with a Unix server in a local network environment.
The user manual should explain how to use all the functionalities, such as e-mail, Telnet and FTP.