The Palette window allows you to create a patch by dragging and dropping bidules on the patchbay. It has two panes: the Bidules pane and the History pane.
This pane contains a list of all available bidules grouped according to your preferences. To add a bidule to the patchbay, drag it from the Palette and drop it on the patchbay.
Find Next is a bidule/VST/AU search utility, it helps track down bidules by name. Once found the highlighted bidule can be double clicked so it can be added to the patchbay.
Use Next behaves exactly like Find Next, but automatically creates the bidule that represents the first match found.