Phoenix.pm: more specific question

[Beaves at aol.com]

When you print to STDOUT, is it a pipe?  or does STDOUT wait until some sort 
of a flush command at the 'death' of the program, and then spill its 
contents...

If it flushes rather than pipes, is there a way to modify the flush routine 
upon its call?

I remember  reading some stuff about this behavior, but I can't seem to find 
it now.

Not  a big deal, but maybe some discussion material.

Tim