It's probably simplest to put your notes file wherever you have your Perl script (or your Perl script wherever you have your notes file...however you want to think of it). You have to specify the name of your notes file when you run the Perl script. I use Windows, so at the command prompt I type 'perl tagcloud.pl notes.txt'. If you want to put your notes file in one place and your script in another, just type the full path to your notes file on the command line (for example, 'perl tagcloud.pl c:\notes\notes.txt').