Is it possible to create custom Host IDs rather than using system defined user IDs?
Host ID's are editable and can be comprised of any values desired. This includes both letters and numbers.
NOTE: The Host ID are required for Data Refreshes so that the system knows which record to update and duplicate records are not created. It is very important that the host ID is unique for each user. Host IDs cannot be re-used or reassigned to different users.