From OpenSCADAWiki
Using — development
The frame is designed to perform the role of page-template, and should therefore be placed directly in the project's tree. In the project-template "Signal groups", for the first signal object, this frame is included in the role of a template that allows you to create on its basis a set of pages of the contours group. To each frame can be connected up to eight parameters, setting the links. Contours and trends, for which there are not set the links, will be hidden at runtime.