Check this option to run a command without any user interface, in other words hidden from the user. The option applies to both Windows and Web Framework applications.
Hidden commands should always have the Default Command option set to NEVER for instance commands or NO for business object commands and the Hide All Other Command Tabs option should never be used.
Obviously, never attach RAMP Destination screens to hidden commands.
Also see Hidden Command Handler Anatomy.
This property is in the Commands Allowed tab.