use POE::Kernel;
print POE::Kernel::poe_kernel_loop;   # --> POE::Loop::Select

##</code><code>##

use POE::Kernel { loop => 'POE::XS::Loop::EPoll' };
print POE::Kernel::poe_kernel_loop;   # --> POE::XS::Loop::EPoll

##</code><code>##

use POE::Kernel;
use POE::Kernel { loop => 'POE::XS::Loop::EPoll' };
print POE::Kernel::poe_kernel_loop;   # --> POE::Loop::Select