Lets you quickly add a node in the network editor or choose a tool in the viewer from a pop-up menu or by typing.
When you press Tab in the network editor, a list of all available node types for the network type appears. When you press Tab in the viewer, the menu lists the shelf tools.
You can select a node/tool from the menu using the mouse or arrow keys, or you can start typing the name. As you type, Houdini will display a list of matches, which you can also navigate using the mouse or arrow keys. Press Enter to select the highlighted node/tool.