success message <expression>,<duration>

success message <expression>,<duration>

Hello, I created a Auto Number field to let system auto create a unique number for each record created in a form.  Is it possible to 
a) display this auto generated number at the time user is entering the record, or if not possible 

b) allow to show to user the auto number within the Success Message once user clicks on Submit button.

Your assistance is much appreciated.