DL #1 is a collection of 59 quantity Apple Hardware Test programs for Intel Macintosh, AHT in the version number range 3A102 lowest to 3A244 highest, dL contains a text file describing all hardware compatibility.
This OVERVIEW link has All the AHT and other Test software here:
http://macintoshgarden.org/apps/apple-hardware-test-cds
AHT is a Firmware program, it does NOT run on any Mac OS.