https://kodi.wiki/view/Main_Page
PVR is used for tuner cards, for signals that come in via antennas.
The \ key switches off and on the full-screen mode.
Kodi can be controlled by a smart phone using the kodi remote app (not the full scope kodi app). To have this working kodi requires http (webserver) support. The connection can be made safer by adding a kodi username and password to the http connection.
http://<kodi_ip_address>
:8080 allows to access kodi via a web browser
For gentoo Linux emerge -pv kodi and check the many useflags as: webserver, upnp, lirc. See https://wiki.gentoo.org/wiki/Kodi there are also some other kodi packages that might be installed manually when claimed to be missing as kodi-inputstream-adaptive