TRIGGERcmd Roku channel
Now you can trigger your commands from your Roku with the TRIGGERcmd Roku channel. Here's a youtube video showing it in action.
Use this link, or search for triggercmd on your Roku.
Unlike most Roku channels, the TRIGGERcmd channel does not play videos on your TV. It let's you run your TRIGGERcmd commands on your computers. It will list all of your commands by default, or you can check the "Have Roku channel display panels instead of computers" checkbox in your profile and it will list the buttons on your panels instead.
For example, I use it to turn on lights in my TV room.
You could also use your Roku to run this command on your computer that plays a Youtuve video on your Roku like this:
curl -v -XPOST "http://(roku IP address):8060/launch/837?contentId=A7vYpIjfyYE"
That plays this Youtube video on a Roku: