Apple Logic Pro 7 - Manual (Page 201)

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The Environment
The Environment is Logic’s “brain”. It allows you to control
all MIDI input and output.
Beyond basic input and output handling, the Environment can be used to process MIDI
data in real time, and can even be used to create processing “machines”, such as virtual
rhythm generators and step sequencers, or complex synthesizer editors.
Environment—Introduction
The Environment refers to Logic’s “virtual” environment inside your computer. It was
developed to allow you complete control over your MIDI setup from within Logic.
Imagine that the Environment window provides a virtual view of your MIDI studio,
including port objects which represent the MIDI inputs and outputs of your MIDI
interface, instruments which are virtual representations of each device in your MIDI
setup, and various objects for modifying the MIDI signal flow.
In order for this to work properly, you need to connect the different Objects in the
Environment via virtual MIDI cables. This allows you to control the overall MIDI signal
flow.
You can also create virtual faders that generate MIDI events when you move them. The
movements of these Fader Objects can be remotely-controlled by other MIDI events,
and recorded by Logic. In addition, there are specialized Objects which can split a MIDI
signal into different channels, make pre-programmed alterations, or even re-route the
signal path.
Layers
As you can probably imagine, the Environment can quickly fill up with a large number
of Objects. To keep things organized, you can assign Objects to different display levels,
referred to as “layers”. Think of these layers as being different, partial views of the overall
Environment. Naturally, you can easily connect Objects between different layers.