Dia is used to create diagrams. Dia has a number of basic tools, like lines and boxes but can also dynamically load "sheets". A sheet is a collection of tools that are used in a certain type of diagram.
Most diagram objects in Dia has "handles". Lines can be connected to these handles and this way graph structures can be formed. When objects are moved or resized the connections will follow the objects.
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This manual was written by Fredrik Hallenberg <email@example.com>