Call System::AutoCmd::RequestResult to determine whether there is a return value after executing the System::AutoCmd::AutoCmd object using the Variant::Exec method. 

System::AutoCmd::AutoCmd declares System::AutoCmd::RequestResult as a pure virtual method. Descendant classes specialized to different call types return a value depending on what type of method they represent. 

System::AutoCmd::GetCallType 

System::Variant::Exec