Pointer+options

You don't want every card in your Wagn to be listed. Even a brand new "empty" Wagn has hundreds of cards, and yours may have thousands or more! To narrow the options, you can add a *options setting which will be a Pointer (by default, but it can also be a Search) for just the cards you want listed. For example, continuing the example if you add "participants+*right+*options" as a Search card with the WQL {"type": "User"} then only User cards would be listed when editing "Making Wikis Welcome+participants".

Actually, in that example there might be so many users that we wouldn't want to have all of the names on screen. If so, you'd use "list" as the *input setting, which lets people type in a name. This could be any card they want (even cards that don't yet exist), but the Pointer will autofill cards that are in +*options. So in our example, this would mean that if I typed "Ja", then the pointer would autocomplete users' names beginning with "Ja".

Option labels

Checkboxes and radio buttons can have supplementary information next to each option. Let's say in our conference website example that we invite each person to share information about themselves on their User card in an included card called "+about me". And then we decided it would be useful to show that information on the Session card when editing our +participant Pointer. We can achieve this by creating an "participant+*option label" setting and setting its content to be "about me".