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 ...
So you want to open that .dat file that you've found on your computer or have been sent by e-mail. Well, I hope you're ready for some bad news! The .dat file extension simply indicates that it's a data file and could potentially have been created by just about any program in existence.