Interaction of String Custom Field Value Lists

[Hawker]

How do the following four parameters in Virtuemart v.3 interact?

String Custom Field

1. Default value (semi-colon separated)
2. Is a list? (yes/no)
3. Additional Parameters: as radiolist (yes/no)


Product>Custom Fields (string)

4. Custom Field Type>Value


For example:

(i) Does 'Is a list?' affect how Default values are displayed, Product Custom Field Values or how a radiolist displays? - All are lists.

(ii) If Default values are specified and saved, then product custom field values inserted, then how will these two lists show and interact?

(iii) Does setting radiolist to 'yes', affect default values, or product custom field values, or both?
Thanks in advance for any clarifications.