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 ...
A file extension is the set of three or four characters at the end of a filename; in this case, .dat. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically.