There are 2 definitions, the first is that is stands for distance education transport logistics and you can find out more about this at:
http://www.gotlogic.se/swedish/projekt/01detl.html
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second is that it is one of two files on your PC, which can be defined as follows:
Detlog.old - Previous Windows detection log file
* This file records the progress of the previous Windows hardware detection process. When you request that new hardware be detected, the previous Detlog.txt file is renamed to Detlog.old before the new Detlog.txt file is created. This file is not necessary for the proper operation of Windows and can be deleted.
Detlog.txt - Windows detection log file
This file records the progress of the Windows hardware detection process. It is created during hardware detection and is consulted by the hardware detection recovery process if the previous attempt to detect hardware caused problems. This file is not necessary for the proper operation of Windows and can be deleted.
You can get more info on this at http://www.cvc.org/howto/strangefiles/