Newsboat Playing XML Files (podcasts)

When setting up Newsboat how can I get a podcast from, say, Podbean, to play?

This is my config file for newsboat.

auto-reload yes
include /usr/share/doc/newsboat/contrib/colorschemes/solarized-dark

external-url-viewer "urlscan -dc -r 'linkhandler {}'"
max-items 0





browser "setsid nohup linkhandler"
macro , open-in-browser
macro t set browser "tsp youtube-dl --add-metadata -ic"; open-in-browser ; set browser linkhandler
macro a set browser "tsp youtube-dl --add-metadata -xic"; open-in-browser ; set browser linkhandler
macro v set browser "setsid nohup mpv"; open-in-browser ; set browser linkhandler
macro w set browser "w3m"; open-in-browser ; set browser linkhandler
macro f set browser "firefox"; open-in-browser ; set browser linkhandler
macro m set browser "handle"; open-in-browser ; set browser linkhandler
#macro c set browser "copy(){ echo $1 | xclip ;}; copy "; open-in-browser ; set browser linkhandler

Secondary question
What does this line of text mean:

macro m set browser "handle"; open-in-browser ; set browser linkhandler

What specifically is “handle”?