(Excerpts from Hacking Exposed written by Stephan Barnes  "M4phr1k")

Ok, if you are going to use the batch process I've described here there are a couple of things to note.

1.  Since you are creating a .DAT file every time there is an option in the tlcfg.exe utility in ToneLoc to Save .DAT Files

It is on line 6 in the Scan Options sub-menu of the tlcfg utility which you run by executing tlcfg on the command line in DOS.  Change this to N parameter to N.  The .DAT files are somewhat useless, but when you execute the command I showed in the Batch file on the previous page toneloc 0000warl.dat /M:*6718005550000 > nul you have to create a .DAT file.  If you don't change this parameter it just means that the .DAT files will pile up and although it's a disk space issue, what it does give you is a count of what happened since if you did every number and wrote every .DAT file then a record of that .DAT file should be there allowing you to cross check your results.  The Tone Log will have a count of your results so you can cross check there if you need to.  Enough said.  Id change it to N and save the space.

2.  Make sure there is room to write the log files and that you are not executing the program on a PGP mounted disk or some other logical disk that may auto-unmount during the process.

3.  Keep it simple.  Believe it or not modems that are older will handle this exercise very well, so will a 386, 486 or older Pentium machine.  It's phone numbers gang so speeding up the dial process doesn't get you that much in this part of the exercise.  What you seek is a good footprint.