Fork

A Fork is a nob where three pipes meet, one incoming pipe and two outgoing pipes. Forks, knots and pipes together form the equivalent of dendrites in biological neural networks.
 * dynamic behaviour: Forks pass through incoming signals on both outgoing pipes.

Operations on knots:
 * Knots can be created in two ways
 * The Create fork command is available in the context menue of pipes.
 * Connecting an input line to a pipe
 * Forks can be moved like other nobs with the left mouse button.
 * Forks, like all other nobs, can be used to select a group of connected nobs by using the context menu or with a left double click.
 * Knots can be deleted. The incoming/outgoing pipes are terminated with output/input lines.