To send custom CEC commands from PC to TV through CEC adapter, you will need to install the CEC client. This is an exe file that is included in the libCEC and Windows driver package.
To install, please download libCEC 4.0.2 from our website. Link to the CEC adapter page =
Please click on the file shown in below image to download.
Run the downloaded file, it opens a standard installation wizard.
Under the section "Choose Components" please make sure all options are ticked.
After installation, you will find this folder installed. The default destination is shown in the image below:
Open a cmd prompt in this folder, and run cec-client.exe -h to show you all the options, as shown below: