Ok, I spent some time to study the source of Net::AIM, and got a few clues to how the module(s) work.

Net::AIM has an event driven model. You need to set up handlers in your code to handle various events. For this particular exercise I assume that the name of the get_info event is indeed get_info. You will need to find out the exact name of the get_info event, by turning on the debug option in the module.

...

# set up a handler to handle the 'get_info' event
sub get_info_handler
{
   # four arguments are passed into the handler, but we
   # are only interested in the second argument, the event
   my $event = $_[1];   # get the event

   # $event->{'args'} contains the returning messages
   # do the processing here ...
   ...
}

# set a handler for the 'get_info' event
$aim->getconn()->set_handler('get_info', \&get_info_handler);

$aim->get_info("screenname");
$aim->do_one_loop(); # this will invoke the event handler
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