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Additionally, positioning the pointer over a connection causes a tooltip to appear that displays the output and input that connection is attached to.
Hovering the pointer over a node highlights the connection between it and other nodes.
Branching
A node’s input can only have one connection attached to it. However, a tool’s output can be connected to inputs on as many nodes as you require. Splitting a node’s output to inputs on multiple nodes is called branching. There are innumerable reasons why you might want to branch a node’s output.
A simple example is to process an image in several different ways before recombining these results later on in the node tree.
A MediaIn node branched to two node operations and then recombined using a Merge node.
Alternatively, it lets you use one image in several different ways—for example, feeding the RGB to one branch for keying and compositing, while feeding the A channel to the Effects Mask input of another node to limit its effect, or feeding RGB to a tracker to extract motion information.
A MediaIn node branched to two different kinds of inputs, used separately.