For Form Display parts, they function differently in regards to sign up requests compared to the User Login part in NetCommunity. When a user creates a new username and password, this creates a "temporary" account for the user to access the form. For the user account to be saved in NetCommunity one of the following conditions will need to be met: 
  1. The form has been completed and submited by the user
  2. The form in progress has been saved by the user
If the "Create Raiser’s Edge sign-up transactions" has been marked on the Login option on the form, this will also generate a sign up request to The Raiser's Edge as well.