Logging can be enabled as follows:

1. Open the command prompt or the CAD Exchanger Batch.
   
2. Go to the CAD Exchanger installation directory (e.g. cd C:/Program Files/CAD Exchanger/bin/).
   Note: when the CAD Exchanger Batch is used (not the Windows command prompt), it is not necessary to change the directory.
3. Set the following environment variables:
    Windows:
   set CADEX_DEBUG=1
   set CADEX_LOGGER_LEVEL=0
   set CADEX_LOG_FILE=%USERPROFILE%/Documents/log.txt
   Mac or Linux:
   export CADEX_DEBUG=1
   export CADEX_LOGGER_LEVEL=0
   export CADEX_LOG_FILE=~/Desktop/log.txt
4. Type the Exchanger command - logging is turned on.
   
5. The log.txt file will be put in the specified directory.