A remote session allows a user to authenticate from a greeter and access a remote system.
Remote sessions are registered with a desktop file in
Name, Comment - May be used in the greeter to describe this session
Exec - Command to run for this session
X-LightDM-PAM-Service - PAM service to authenticate with
Instead of using standard authentication each remote session defines its own PAM service.
This service should contact the server providing the session, perform authentication and then the command specified in Exec should run a program that displays the remote session.