Cache variables provide a means of processing information throughout a flow instance without requiring that the information to be passed through data links.
Cache variables can be specified at different locations.
Cache variables can be defined and manipulated through flow library, flowlib functions.
Cache nodes allow you to set cache variables using the Link UI settings dialog, in the Flow Designer canvas.
Cache variables are name value pairs that exist after the flow instance completes execution. Unlike flow variables, cache variables are shared, and are accessible to other flow instances that are running simultaneously. Cache variables work in the same fashion under both flow engine and non-flow engine contexts.