The video and sample files below cover the topic of how to learn and use IR commands that you will be sending from RXC, RXT, LXC, and DXB controllers.
Note: The method for sending IR from VLX and VPX devices is a different process. Learning from these devices can be done using IPBaseT Manager, and sending commands in ReAX is done via TCP commands to the VLX/VPX. You can fine more information in the VLX & VPX documentation, as well as here: https://support.auroramultimedia.com/blog/reax-control-systems-3/using-aurora-devices-as-port-extenders-8