Call System::AutoCmd::GetNamedParmName to determine the name of an argument that was assigned using the << operator. 

The idx parameter is the index of the value in the System::AutoCmd::AutoCmd object’s named parameter list, where 0 is the index of the first argument. Use the GetNamedArgCount method to obtain an upper limit of possible values. 

System::AutoCmd::operator_streaming 

System::AutoCmd::GetNamedArgType 

System::AutoCmd::GetNamedParm 

System::AutoCmd::GetNamedArgCount