Can Variables grab /?foo characters from the URL that called a form?

You can use a {get:*} magic tag for this. See: https://calderawp.com/doc/using-magic-tags-caldera-forms/

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Thanks!
Follow up: what variable type is appropriate (or is it used elsewhere else)?

Hi There.,

at 1st you set Redirect to the URL:
https://mydomain.com/caldera-form/?post_requested=10226

set the variables from that form field as Passback

And then at the 10226 page you set Caldera Forms field Value with {get:*}

example.
1st form you have Full Name field and passback it with Fn variable name and %Full_Name% Value

and then on the 2nd form you can set Full Name Value with {get:Fn}

Hope this’ll help, Tq