See POE::Session and POE::NFA for one type of session. CPAN
also have others.
See Sessions in POE::Kernel for a discussion about POE::Kernel
See Session Lifespans in POE::Kernel to learn why sessions run, and
how to stop them.
See Session Management in POE::Kernel for information about managing
sessions in your applications, and the events that occur when sessions
come and go.
See Session Helper Methods in POE::Kernel for friend methods between
POE::Kernel and POE::Session classes.
See Resources in POE::Kernel for public information about POE
See POE::Resource for general discussion about resources and the
classes that manage them.