io-winmgr usage

The io-winmgr configuration file is default file(winmgr.conf).When I use io-winmgr command to start composition manager.But there is nothing on the screen.That OpenKode programe cann’t operate.The default io-winmgr configuration file is wrong?How to write io-winmgr configuration file?How to use io-winmgr and OpenKode program?
Thank you very much !