I wouldn't call it trivial if people have no experience with POE. I for one didn't understand from your example how you were suggesting it would help him towards his goal of retrieving no more then 10 at a time.

After reading the POE, POE::Session, & POE::Component::Client::UserAgent I *think* what you're suggesting is that the poster modifying 02multi.t so that this...

POE::Session -> create (
    inline_states => {
          _start => \&_start,
          _stop => \&_stop,
          response => \&response,
          _signal => \&_signal
      },
  );
[download]

becomes this...

for (my $i = 0; $i < 10; $i++) {
    POE::Session -> create (
        inline_states => {
              _start => \&_start,
              _stop => \&_stop,
              response => \&response,
              _signal => \&_signal
        },
     );
}
[download]

and change _start to only loop over a 1/10 of @urls.

Does that sound about right?

Frankly, i'm still not clear on why this can't be done in a more straight forward manner with LWP::Parallel directly, It has the functionality to limit the number of parrallel requests to an individual server -- OR to limit the number of different servers it sends requests to at the same time, ... why isn't there a more general way to limit the TOTAL number of parrallel requests?