To actually use the tool, you will need to register (for free!) for an account on Genie. You will receive an SMS message giving you a validation key which you should enter on the web site to activate your ability to send SMS messages from there.
The application should run on any UNIX box (only tested on Solaris and Linux so far). Just run:
perl Makefile.PL make make test make install
It also runs on Windows98 using the SiePerl binary distribution also available from CPAN which has the Tk modules included. You will still need to obtain the Net::SMS::Genie module. I presume it will run on other flavours of Windows but this is untested. I am not entirely familiar with Windows so I only make a crude guess at the username to determine where to find the user's phonebook. I am working on this, but if anyone comes up with a fairly robust method, I'd be grateful...