Development

Set up environment to test multiple monitors

From https://superuser.com/questions/538789/emulating-extra-displays#:

First create the Xephyr displays

Xephyr -screen 1920x1080 -ac :1
Xephyr -screen 1920x1080 -ac :2
Xephyr -screen 1920x1080 -ac :3

This creates 3 windows 1920x1080, each of these will act as a monitor

Next add the xinerama layer onto these virtual displays

Xdmx +xinerama -xinput local -display :1 -display :2 -display :3 -ac :4

Next create a fresh terminal and start your window manager

DISPLAY=:4.0
xmonad

Systray

https://specifications.freedesktop.org/systemtray-spec/systemtray-spec-0.2.html#overview