shuffling / programming/ algorithm

Hola: algorithm

I want to do a question for those of you that are doing SIM software.
can you explain me the algorithm used to sim the shuffing procedure of the dealer???

I do this question because aparently this issue is the "point", when compare the sim on Counting, shuffle tracking, and finally progression (sorry about the word).

Can the procedures used in soft programming replicate the procedure used by the dealer in shuffling???? and, Obtain the same patterns (or whatever) that the dealer???

I am programming a simulator, and I don't want to make a mistake in this item, because i believe that this is "THE POINT".

TNKS in advance

saludos