The users app allows an administrator to create, delete and modify users on the system. Marketplace apps that plugin directly to the user directory will automatically display options available to a user account. For example, if the PPTP Marketplace app is installed, an option for allowing VPN access to the server via the PPTP protocol will be displayed.
To learn more about this app, click here
Documentation for ClearOS 6 can be found here.
Documentation for ClearOS 7 can be found here.