I was given a custom form which is a contact item, and it had
"Assigned To" on it, which behaves exactly how it does on a Task
Form. When I looked at the "All Fields" tab and look under "All Task
Fields" there is a property called "Assigned To".
I think it's part of the recipient object though. I don't think it's
the Owner property that will help. I'm not that familiar with the
Delegator one though.

I'm not sure how to use "{00062003-0000-0000-C000-000000000046}" -
I'll have to do some research on it.