Commands are small pieces of information sent to the fronted for execution.
they are used to update widgets, to load
CSS code or to call some other functions
inside the frontend.
Right now this mechanism is not really useful because there is no a way to define custom commands handler on the frontend. But in the future such facility may be added.
Returns all commands created during
AJAX request processing in order as they where added.
Pushes a new command into the stack.
After action processing these commands will be sent for execution on the client.