Installation guide of XIBO 1.8 on CentOS 7

Hello im stuck here:

XMR
/var/www/xibo18/vendor/bin/config.json
{
“listenOn”: “tcp://IP_ADDR:50001”,
“pubOn”: [“tcp://IP_ADDR:9505”],
“debug”: false
}

XTR
EDITOR=joe crontab -e
’* * * * * /usr/bin/php /var/www/xibo18/bin/xtr.php’

Can some body tell me what means XTR and XMR?