The following syntax describes a COM object method access with optional chaining of COM object references:
This syntax describes a potential chain of COM object references that result in a COM object method call. Method-Name is the effective name of the invoked method. COMparm is a parameter as required by the method (see COMParm). You must not follow the colon separator by a space.
Any COMProperty or COMMethod that precedes the final Method-Name must return a COM object reference that provides access to the immediately following Method-Name. The final method call can return any supported COM data type.