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First things first

Green Book is about DEVICES placed in LOCATIONS and connected by WIRES.

Locations conforms a hierarchy: BUILDINGS, ROOMS, RACKS or DESKS, FRAMES, SLOTS. Devices reside in racks, desks or frame slots.

You don't create devices directly. First, you create a "device definition" (for example, a UTAH DA) in the Device Library; then you place an "instance" of that definition on the intended location. Definitions are sort of templates from which you create devices. They are reusable; as you create more and more definitions, you will find your self reusing more and expending less time in creating new ones.

Once you have devices in place, you can interconnect them with wires. To do that, you just enter the wire number in the device's port you want to "connect". If the wire does not exist in the database, it is automatically created; if it exists already, it is found and "connected" for you.

The point of having devices interconnected this way is that now you can navigate the GUI from device to device just by clicking at the wires. In each stage of your navigation you will have a complete view of the device (device type, manufacturer, model, etc, all its inputs and outputs), all wires connected to it and an indication of its location. You will also have access to ancillary data associated to that device such as manuals, engineering notes and a history log.