InterSystems##super Syntax
Suppose that a subclass method overrides a superclass method. From within the subclass method, you can use the ##super() syntax to invoke the overridden superclass method.
Note:
##super is case sensitive and must be in all lowercase.
For example, suppose that the class MyClass.Down extends MyClass.Up and overrides the Simple class method. If the code for MyClass.Up.Simple is:

ClassMethod Simple()
{
Write "Superclass.",!
}

and the code for MyClass.Down.Simple is:

ClassMethod Simple()
{
Write "Subclass.",!
Do ##super()
}

then the output for subclass method, MyClass.Down.Simple, is:

>Do ##Class(MyClass.Down).Simple()
Subclass.
Superclass.
>