From Xojo Documentation
| This item was deprecated in version 2020r2.
Please use Thread as a replacement.
Used to run code in the background. Xojo threads are co-operative (not pre-emptive).
These constants can be used to set the Priority of the thread:
PriorityHigh 10 Recommended for high priority threads.
PriorityLow 1 Recommended for low priority threads.
PriorityNormal 5 Default priority for threads.