The System::Function class represents a single method on an Automation interface that is assigned as the value of a Variant. It can be executed using the Variant’s Exec method. 

Each System::Function instance is assigned a name, which is the same as the name of the corresponding method on the interface. In addition, it can be assigned parameters that correspond to the parameters of the method. These parameters can be stored by position or by name. 

System::Variant 

System::Procedure 

System::PropertyGet 

System::PropertySet