12.1. Working with Collections12.1.1. Determining Whether an Item Belongs to a Collection12.2. Class Modules12.2.1. Properties, Methods, and Events12.2.1.1. Working with Properties12.2.1.2. Working with Methods12.2.1.3. Working with Events12.2.2. Web Services and CustomUI12.3. Using VBA Custom Properties12.3.1. Setting Up the Custom Properties12.4. Saving and Retrieving Values from the Registry12.5. Conclusion