The invention relates to a closure cap for a fixed neck of a container, especially of a radiator of a motor vehicle. In various embodiments, such analysis can include time series analysis, multivariate correlation analysis, cluster analysis, anomaly detection methods, multi-dimensional density analysis and demand modeling. A display surface may be attached to a housing in which the display surface is sensitive to input of a pen device. A peer device having received recommendations from the other peer devices in the P2P network then programmatically, or automatically, selects a next media presentation to play from the media presentations recently played by the other peer devices and one or more locally stored media presentations. The main assembly is operable to receive the center link and a head of one of the fastener elements and secure the center link and the head relative to the main assembly when in a locked position. The basic components are castings and simple formed sheet parts.