To include a clickable button, or text in P3D you could use either a <click_to_event>, or a <click_to_run> tag, the first allows jumping to another slide, or layer within the current show, the second allows you to launch a new show. Here we will deal with the second method the <click_to_run> tag.
A good example of why you might want to lauch a new show would be using P3D to create menus that organise all of the shows you need for a particular presentation, event, or even for a visualisation center.
There are two main items required to launch a new show :
1) The path to and name of the show you want to lauch.
2) The item that will be clicked. This can be OSG text using the <bullet>, or <paragraph> tags an image, or images, or even a model.
An empy line will seperate menu items.
In the example below, a bullet has been used to create the clickable text and an image that is also clickable has been included.