Finally figured out a simple way to cast media from my netbook to my TV box.
On the Android box:
1. Install AirPlay/DLNA Receiver (LITE or PRO) from https://play.google.com/store/apps/details?id=com.waxrain.airplayer&hl=en
2. Launch the app. Turn on DLNA DMR then set a device nickname. Apparently also works with AirPlay and AirTunes if you want to stream from an iPad/iPhone.
On the Windows box:
2. Install http://download.waxrain.com/AirPinPcSender/AirPinPcSetup.exe to send media from Windows to receiver.
3. Browse for media file on Windows machine; right-click and select Cast To Device or DLNA Play to > [your android device].