This system for predictive analysis of digital data time flows associated with text information comprises means for automatically predicting values of a digital data time flow from past values of said flow. Data may be transmitted bi-directionally between selected endpoint devices and data collection devices to central or head end equipment. Etch back the first fill material until completion of removal thereof from the wide trench. A number of vanes extend from one or both sides of the disc, the vanes spacedly located near the outer edge of the plate. The sequence of actions in the macro file can be produced by storing commands, applied to a data file opened in the application program, into a log file and transferring at least one stored command from the log file to the macro file. The update control circuitry has a priority dependent modification mechanism such that the modification to the at least one count value is dependent on the priority of the processing operation with which that update data is associated.