Perl implicitly forks a child process. the FILE file handle is opened with write access in the parent process. what the parent process writes to FILE can be read by the child process via STDIN. this allows you to do simple ipc communication between the parent and the child process. for example:
Why would you ever do this? When would this be used?
Like it says - to feed data to anothe rprocess - maybe an external program. Or, as in my case, talking to yourself -
http://iis1.cps.unizar.es/Oreilly/perl/prog/ch06_02.htm#PERL2-CH-6-SECT-2.2.2
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