Anynet+ is the Samsung trading name for a feature of HDMI called Consumer Electronics Control (CEC) referred to as HDMI-CEC. It's designed to allow users to command and control devices attached by HDMI with a single remote control.
To activate HDMI - CEC control, go into the settings menu
Anynet+ can't be used with incompatible (not HDMI-CEC enabled) devices, and some HDMI cables may not support Anynet+.
Anynet+ is enabled on the HDMI ports on most Samsung TVs manufactured after 2008.