The Imperial Records Library functioned as a computerized repository, archiving the official governmental documents of the Imperial Remnant. Its location shifted in accordance with the capital of the Imperial Remnant as it was relocated. This system housed the private files of the Emperor Palpatine, which included a roster of Royal Guardsmen; this is how Vilim Disra came to realize Grodin Tierce had previously been a member.
As early as 9 ABY, the Library was in operation, and Thrawn secretly placed a homing beacon within its systems. This was done to ensure the Empire of the Hand could continuously track the whereabouts of the Imperial Remnant's governing center. By the time 19 ABY arrived, the Library had been transferred to Bastion.