The ANA program

The ANA program was a computer subprogram created by the Bajoran engineer Neela in 2369. This subprogram was located in the security field subsystem.

Chief of operations Miles O'Brien found this program while checking several systems and tried to get access to this program. The computer denied him access to the program based on a personal security access code forged under O'Brien's name.

The program was protected by a series of encryption sequences, which Lt. Jadzia Dax attempted to decrypt with an adaptive program. According to O'Brien, they were lucky because they were working with a Cardassian computer, which limited the program to no more than seven encryption sequences.

After O'Brien and Dax decrypted the access code, 4-1-0-0-R-L-X, they discovered that the command protocols of this program included a system of sequential overrides for the security fields around runabout pad A – an escape route. (DS9: "In the Hands of the Prophets")

Originally, Anara was to be the character who attempted to assassinate Vedek Bareil in the episode. Although the character of Neela was later created for that purpose, the code "ANA" was retained from that early draft. (Star Trek Encyclopedia (2nd ed., p. 435); Star Trek: Deep Space Nine Companion (p. 66))
One of the encryption sequences shown during the computer's search reads "GENE ROD", a reference to Star Trek creator Gene Roddenberry, while another reads "NCC1 701", a reference to Star Trek's famous ship, the USS Enterprise.
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