PPM is a package mangement tool, pp is an packaging tool. You could use it to make a single stand alone executable which will contain all of your modules (their prerequisites and so on) that your application needs, this executable can be run on machines that don't have Perl installed, so you wouldn't have to install/maintain a distribution of Perl on each machine you wanted to run it on, or worry about how you would get all of the modules you need installed on each target machine.

So in theory you could develop your application, package it using pp (once for Linux, once for windows) and distribute the executable.

If I was in your position I would opt for packaging up the application, rather than have to support Perl (ensuring all of the modules you require are installed) on X number of machines which are 'offline'.

Martin