class Box // Class of Box - this is a description not an Instance
{
  public: // Any client can access Public Methods
    void SetWidth(int Input); // Declaration of Method to set width
  private: // Members are only available through Methods
    int Width, Length, Height; // Class Members (Properties)
}

void Box::SetWidth(int Input) // Definition of Method to set width
{
  Width = Input;
}

Box MyBox; // Object (Instance) MyBox of Class Box

MyBox.SetWidth(2); // This will set the Width for the Object MyBox to 2

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In C++ Properties are known as "Member Variables" or "Data Members"

Does this help??

Alan.