connecting to an app on an appvm from lan

[Qubes]

How does one go about connecting to an appvm from another device on your
LAN? Is there any documentation on this?

Just to avoid confusion a device on the same network as where sys-net
gets it's network from.

[unman]

https://www.qubes-os.org/doc/firewall/ covers in some detail in the
section on "Port forwarding"
If you hit problems, give some detail on what you have done, and we
should be able to help.