All user functions defined in the current application are automatically available in the script mode. Besides the explicitly defined functions described under "User Functions" topics in the application-specific navigation subtrees, each application defines a lot of implicit user functions, most of them as convenient shortcuts for some longer expressions.

application_name;
is a shortcut for application "application_name"; provided the application is already loaded.
ObjectType( [ "name" ], "PROPERTY_NAME" => value, ... );
is the same as the object constructor call with immediate commit afterwards. This function also employs a little magic for guessing the object name from the variable name it is assigned to:
$abc=OBJECT_TYPE( ... );
will set the object name to "abc". If, to the contrary, called in a void context, it assigns the new object to the variable $this.
PROPERTY_NAME; METHOD_NAME;
are shortcuts for $this->PROPERTY_NAME and $this->METHOD_NAME for all defined object properties and public methods respectively. Indeed, you can also pass arguments to the method.