The idea initially starts with a concept like gnome-do or kupfer, where commands can be entered through a completion interface.
The Human shell concept is intended to continue such an interface for all commands used on the system, not just for launch. The user may launch an application using a command (through command completion or via some other input mechanism)
Example 1: "wikipedia" is entered by user and is loaded, changing scope to "wikipedia". "someting" is entered by user, searching wikipedia for "something".
Example 2: "map" is entered by the user, loading map application and changing scope to "map". "search 123 someroad" is entered by the user, causing this address to be loaded.