Closed-loop systems are able to correct in order to meet target results. Normally a sensor is used to look at the output and adjust the process accordingly. This is called feedback.
A file with an extension of .DAT is known as a Data (General). These .DAT files can be opened on Windows and Apple using programs ...
These four categories have the file extension IDX and are less then one KB in size. The fifth file generated is named LYRAPDB.DAT, and is a text file containing information such as band names and song titles, along with what seems to be file name shorthand often used by programs for file management.