To run PPL code you first have to install PPL.
A simple way to try out source code is to use PPL's single script file execution feature. Here is an example of how to proceed:
hello.ppl with the following content:
repeat 3 times OS.out.write_line ( "Hello world" ) .
Execute the script with the following OS command:
Hello world Hello world Hello world
More ways to execute code are explained here.