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 ...
IDX & DAT File Format. The IDX is an index for a DAT archive file. The first 4 bytes in IDX file is the number of items described in the IDX file. Then all the items are listed. Each item is 28 bytes.