Example when Canton User's primaryParty makes a difference?

Questions
1

I’m trying to assemble a simple example in which a Canton User’s primaryParty makes a difference.

For example, in the following script, all three commands are submitted by an admin user with None primary party. The primaryParty (or lack thereof) makes no difference here:

  alice <- allocatePartyWithHint "Alice" (PartyIdHint "Alice")
  bob <- allocatePartyWithHint "Bob" (PartyIdHint "Bob")

  adminId <- validateUserId "admin"
  createUser (User adminId None) [CanActAs alice, CanActAs bob]

  aliceTV <- submitUser adminId do
    createCmd Asset with
      issuer = alice
      owner = alice
      name = "TV"

  bobTV <- submitUser adminId do
    exerciseCmd aliceTV Give with newOwner = bob

  submitUser adminId do
    exerciseCmd bobTV Give with newOwner = alice

The docs say:

  • “indicates which party to use by default when submitting a Ledger API command request as this user” 1.
  • “Navigator… you will interact with the ledger as the primary party of that user.” 2.

Maybe I’m beginning to realize that primaryParty is metadata for tooling to use, not the Ledger API itself. Is that correct? Aside from Navigator, do you know of any other time that primaryParty is used?