The _fids utility displays File ID information about all open files. For each file open, the channel number, name of the file, type of file, record size, number of records, current key/index, etc., is displayed. _fids may be CALLed or RUN, though it is preferable to CALL it. There may be more than one page to display, and _fids requests confirmation before displaying subsequent pages.
When _fids terminates, the ESCAPE verb is the last item executed because if the program were allowed to terminate normally, it would close all open files.