This is the Agency. Among Agents and other programs, it is referred to as the Mainframe.

Here you will find programmers, machine spies, higher-ups, and everything else contained within the mechanical spectrum.

It is located within an outer layer of the Matrix program where computer programs exist as coding rather than physical beings (The entrance remains physical, something like an office building, but doorways and hallways lead into code). It is also where the Architect resides.

An intense screening process greets each entering or departing program to ensure the security of the machine HQ. It is improbable that you can infiltrate this area, though not impossible..