I do not know all the details of the program, but I have a friend who is currently enrolled in it, and this is my understanding:
You must have applied for the current application cycle.
You must have been interviewed for a seat in the class.
Then you are interviewed for the post-bacc program at a later date (once the admissions committee meets and decides accept/reject).
Then a committee meets on whether to accept you after interviewing for the post-bacc program.
If accepted, you take a DAT prep class the summer prior to starting the post-bacc program. You are taking the class with the other post-bacc program students. You must take the DAT at the end of the summer and score an 18AA.
Then you enroll in a rigorous science schedule (decided on by the dental school) at either UNT or UT-Dallas. You must maintain a certain GPA (not sure what it is). If you meet the requirements set forth by the program, then you are guaranteed admission into the following class.
For example, my friend applied Summer 2006. Interviewed October 2006. Was not accepted to the dental school. Invited for interview for post-bacc program in Spring 2007. Accepted to post-bacc program Spring 2007. If she fulfills the requirements, she will be a DS1 Fall 2008.
Another thing, if you are enrolled in the post-bacc program, you are supposedly not allowed to apply to any other dental schools. So, my friend could not apply to any other schools this year.
If anyone knows anything else or anything different, please correct me if I am wrong.