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 ...
What is a DAT file? Many different programs use the .dat file extension. When you see a file on your computer with the .dat extension, all it really means is that the file contains some type of computer data. There is really no way to tell what type of data the file contains unless you open it.