All TARDIS units have Matrix Interface links installed. These can be used by the Time Lord to access the vast amount of information stored in the Matrix, aside from anything restricted by the High Council. The link is, unfortunately for some, two way, allowing the Council to spy on the whereabouts and movements of renegade Time Lords. This is one of the reasons why renegades tend to favour outdated models as they are harder to track and tend not to be missed as quickly.
Use of the Matrix interface reduces the difficulty of any research task by 3 when using the TARDIS computer. However, it also leaves the TARDIS open to direct Time Lord interference. The link can be disabled but it’s an Ingenuity + Technology roll (Difficulty 30) to do it. Worse, failure will damage the circuit, crippling the navigation controls which will in turn add +30 to the difficulty of piloting the TARDIS until the Interface is repaired (Difficulty 27 task). The Justice Station has multiple links to the Matrix, one in each courtroom and a second in every set of quarters used by counsel.