Autocompletion can be used to find out what commands and parameters are available. Pressing the Tab key twice displays all the commands at the top level, as shown in the following screen example.Pressing the Tab key once after partially-typing a parameter name automatically completes the parameter name, unless there is more than one parameter name beginning with the typed characters. If more than one parameter name begins with the typed characters, then Tab Tab displays them all.Pressing the Tab key after a parameter shows the parameters at the next level down in the parameter tree.