# Editor overview

The Editor is a tool used for adding, changing and deleting
items in files. It is a line-oriented editor, and provides an assortment
of commands that move the line pointer to specific attributes (lines)
in the item being edited. The . (period) is the prompt when working
in the Editor.

Since everything in D3 is an item in a file, the Editor
can be used on any item in any file, unless otherwise prevented by
retrieval or update lock codes. Each attribute in an item being edited
is treated as a separate line. The numbers to the left of the attribute
indicate the line or attribute number.

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Source: https://d3codex.com/editor/editor-overview/ - part of the D3Codex reference.