The $_[KERNEL] is just an indexed access to @_ using the predefined constant KERNEL - using the constants like this allows for one thing POE to not have to document explicitly the order in which all of the arguments are passed to the method.
Update: frodo72 pointed me to http://poe.perl.org/?POE_FAQ/calling_convention that explains this rather nicely.
/J\
In reply to Re: POE and $_[KERNEL]
by gellyfish
in thread POE and $_[KERNEL]
by talexb
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