Test.console is the app with the most general commands. Note that you don't need to be connected to an AP for the app to work.
Type 'help' in the command prompt for a list of commands. You can try out scan, status, join, leave, join_ent, leave_ent, start_ap, stop_ap.
The command console can be used to call any function, not just wifi related calls. Check out snip.led_example for an example for defining your own commands. You can also look at the folders in libraries/utilities/command_console to see the commands already defined in WICED